Customer Ratings & Reviews
- Model:
- BU3521
- |
- SKU:
- 6583331
Customer reviews
Rating 4.5 out of 5 stars with 277 reviews
(277 customer reviews)Rating by feature
- Cleaning Quality4.7
Rating 4.7 out of 5 stars
- Maneuverability4.7
Rating 4.7 out of 5 stars
- Ease of Assembly4.8
Rating 4.8 out of 5 stars
Customers are saying
Customers highly value the lightweight design, powerful suction, and long battery life of this cordless stick vacuum. The auto-empty feature and HEPA filtration are also frequently praised, while some users mention the dustbin could be larger. Many appreciate the ease of use and the helpful LED lights.
This summary was generated by AI based on customer reviews.
Rated 4 out of 5 stars
Vacuum
||Posted . Owned for less than 1 week when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Well established product. Great cleaning capabilities
I would recommend this to a friendRated 1 out of 5 stars
Frustrating
||Posted . Owned for 2 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.I have a small area rug in the living room and tile floors. If you have kids and pets, this is not the one for you. If you just have dust and a little dirt now and then, it's perfect. By far the worst cordless vac I've owned, I gave it the benefit of the doubt for 3months. It will clog within the first 2min of usage due to the 1/2" inlet at the brush side of it. Very frustrating just pushing dirt around. I've owned much cheaper Amazon brands that did a much better job. Make sure to spec out the size of your inlet tube before purchasing a portable vacuum. The self cleaning option is all I like about the unit.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi dear customer,
Thank you for sharing your detailed experience with the Shark Clean & Empty Cordless Stick Vacuum. We're glad to hear you found the self-cleaning brushroll feature helpful, but we're truly sorry the vacuum hasn’t performed as expected for your household needs—especially with clogging and difficulty handling pet hair and debris.
We understand how frustrating it is when a vacuum doesn’t keep up in a busy home, and your insights regarding the inlet size are appreciated. Your feedback will be shared with our product development team as we continue working to improve functionality for a variety of home environments.
If you’d like to explore a model better suited for homes with pets and children, or need further support, please feel free to reach out to us at 1-855-427-5127.
Kind regards,
Shark Clean
Rated 3 out of 5 stars
Very nice but bad battery
||Posted . Owned for 3 weeks when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Very nice vacuum, light but battery life is less than 30 mins, which can not finish not even a floor. Hopefully it's a faulty one, will contact CS to see what BB can do for me, but if not I'll give 5 stars
I would recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Ginux,
Thank you for sharing your experience with the Shark Clean & Empty Cordless Stick Vacuum. We’re happy to hear that you like the vacuum’s design and performance, but we understand your concern about the battery life.
While runtime can vary based on the power mode and surface type, you should be getting enough time to complete a full cleaning session. We recommend ensuring the vacuum is fully charged before use and checking that it’s not running on Boost mode continuously, as that can drain the battery faster.
Since you’re already planning to reach out to Best Buy, we hope they can assist you, but if you need any support from us, please don’t hesitate to contact our team at 1-855-427-5127. We’d love to help troubleshoot and ensure you get the best performance from your Shark vacuum.
Kind regards,
Shark Clean
Rated 1 out of 5 stars
Bad Design - Handle Will Break With Normal Use
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.I bought this to replace another Shark unit we had used for 3 years with no problem. However, the handle on this one broke after 2 months of use. The handle that leads to the battery can't withstand the leverage of use. Once it cracks/breaks, the whole unit is useless. I don't recommend than anyone buy this model.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Brian,
Thank you for taking the time to share your experience. We regret to hear about the issue with the handle breaking after such a short period of use. That’s certainly not the durability we strive for, and we understand how disappointing this must be, especially after having a positive experience with your previous Shark unit. We appreciate your feedback and will share it with our product team. If you haven’t already, we encourage you to reach out to our support team at 1-855-427-5127 Mon – Fri 9am — 9pm ET | Sat. 9am — 6pm ET, who may be able to assist further or explore possible solutions.
Kind Regards,
Shark Clean.
- Pros mentioned:Battery life, Suction power, Weight
Rated 5 out of 5 stars
Great Cordless Stick Vacuum!
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.The Shark - Clean & Empty Cordless Stick Vacuum is a great tool for cleaning your home and the auto-empty feature makes it very convenient. Following are my observations after using it to vacuum my house several times: - The vacuum came neatly packaged. When you open the box top there is a Quick Start Guide on the box, as well as a QR code to scan for instructions, plus there were instructions included in the box also. - Assembly was quick and easy. The Quick Start Guide was easy to follow. There are also easy to follow directions on how to maintain and clean the filters and dust bins on both the docking station and handvac.. - It comes with a 5-year limited warranty and a 2-year warranty on the battery. - A Duster Crevice Tool and Pet Multi-Tool are also included in the box. - The vacuum is lightweight and compact, so it does not take up a lot of space. - It has an LED display which shows the battery status and which cleaning mode you are on. - There are LED lights on the front of the vacuum that are bright enough to be able to see under furniture while vacuuming. - The vacuum has 3 modes of cleaning - ECO is the lowest setting and saves battery power; Auto is the middle setting and is nice because it automatically adjusts to different floor types when switching between carpet and hard surfaces like tile or wood; and Boost provides the strongest setting, while using the most battery. - I have used it on the Auto setting to vacuum my house and the battery lasted approximately 20 minutes on a full charge. If I use it on ECO setting the whole time, I can get about 45 minutes of run time. - While each setting provides more suction, I found the ECO setting to provide great suction for normal vacuuming use, and this provides the most battery life. The Auto setting is nice for the automatic adjustments between floor types. The Boost setting would use the battery life the quickest. I didn't find a need for that much suction in my house, but if you have an area that needs a little more attention, it is nice to be able to do a quick switch to Boost mode. Overall, I felt the vacuuming suction was great! - The vacuum is lightweight and it makes it very easy to vacuum my stairs. - I also used the handheld part to vacuum off my furniture, which was very lightweight and made cleaning the furniture very convenient. I do not have any shedding pets in my home, but I can see where the handheld mode with the Pet Multi-Tool would come in super handy for cleaning all furniture, curtains, etc. - After every use you just put the vacuum on the base and it automatically empties the vacuum and charges it for your next use. I love this feature! it is so nice to not have to empty the vacuum each time. It says the base will hold dirt and debris for up to 30 days. I haven't had it that long yet, but I did empty the base to try it out and it was an easy process. The charging base is also compact and does not take up much space. If the entire battery has been used up, it takes about 2.5 hours to fully recharge it. - This vacuum is not as loud as most vacs I've used. Overall, I am really impressed by the Shark - Clean & Empty Cordless Stick Vacuum! It provides great suction, is well-designed with a number of great features and is very light weight, and the automatic emptying and charging feature makes it very convenient. I highly recommend this vacuum!
I would recommend this to a friend Rated 3 out of 5 stars
Vacumm
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Don't pick that easy stuff gets stuck and when turn off it comes back. Won't stay down keep locking up.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello Mayra,
Thanks for sharing your review.
We're sorry to know that your Shark Stick Vacuum is turning off and won't stay down. We understand how disappointing this can be. Please reach out to our team by phone at 1-855-427-5127; we'd be happy to help you get this sorted.
Kind regards,
Shark Clean
Rated 1 out of 5 stars
terrible
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.It does not clean up pet hair and gets clogged constantly. I have only had it since June and it has now stopped running.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello Victoria,
Thank you for taking the time to leave a review.
We truly regret to learn about the inconvenience caused by your Cordless Stick Vacuum constantly getting clogged and that it has now stopped working. Your satisfaction is very important to us, and we want to ensure you have the best experience with your unit. Please don’t hesitate to give us a call at 1-855-427-5127, and we’ll do everything we can to assist you.
Kind regards,
Shark Clean
- Pros mentioned:Battery life, Suction power, Weight
Rated 5 out of 5 stars
Another outstanding vacuum from Shark
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.This is my 4th Shark cordless vacuum, and they have all been outstanding. This new model adds the convenience of having a docking station that not only charges the battery but also empties the dustbin whenever the vacuum is placed in the dock. The vacuum is very similar to the most recent Shark I got which is the Detect Pro. This new vacuum is very lightweight and easy to assemble. The vacuum has 3 parts consisting of the main power head, wand and floor brush. The docking station consists of 2 parts. There are also a crevice tool and pet brush for furniture. The docking station has what they call a quiet mode which turns off the auto empty function so if you are only doing a small area and the dustbin on the vacuum does not fill up you don’t have to empty it. The emptying function works great and removes all the dirt in the vacuum. The vacuum itself provides more than enough suction for carpets and hard floors. The vacuum moderates suction based on the surface you are cleaning. The display on the top shows the battery level and provides 3 different settings for Eco, Auto and Boost. Auto will adjust the suction based on the flooring you are using it on. The floor brush features LED lighting which is always a big plus. There are filters for both the vacuum and docking station that can be washed with water only. Even though the battery is charged in the docking station it is still removable and there is a charging port, but the vacuum does not come with a charger. The quick start guide lists the chargers that can be purchased separately if needed. I tend to vacuum different areas of my house at different times, so I have not really seen how much battery life it has. So far, I have not run out of battery for my cleaning needs. Like all of Shark’s vacuums this performs as well as any of them with the benefit of having the docking station to empty the vacuum and charge the battery. I would not hesitate to recommend this vacuum to anyone looking for a light weight and powerful vacuum with all the added features.
I would recommend this to a friend - Pros mentioned:Battery life, Ease of use, Suction power
Rated 5 out of 5 stars
Super light and powerful
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.The Shark - clean and empty cordless stick vacuum is not my first vacuum of this type. In fact, I have more than a couple stick vacuums from other brands. Some, like this Shark clean and empty have the automatic emptying canister and some don't. I am a big fan of these types of vacuums and it seems that every year, the next generation gets better and better. This particular vacuum, in my opinion, is the best one I have had so far. The Shark is extremely light weight. It feels much lighter than the others that I have. The motor and canister are not just light weight, they are also slim. These are two attributes that I really think are important in this type of vacuum. The Shark is simple to put together. Everything just snaps into place. The stand serves double duty as both a charging stand and the automatic emptying base. One thing with this Shark that I really like is the fact that when you remove it from the charging/emptying base, the canister on the vacuum itself closes. The other vacuums I have do not, and I often find myself vacuuming with the little door open and after realizing it, I have to go back over everything again. It is something simple, but is super nice to have. The battery lasts for a long time and charges fast. Maybe the number one thing in a vacuum is suction power. The Shark is more than strong enough to handle any type of floor. This particular Shark also has the ability to sense the workload and adjust the power level according to how much is needed. The whole package is slim enough to fit into a corner for easy access and blends into its surroundings. the cleaning head has a bright led light and excellent pick up on both hard wood and carpet. It comes with a couple accessories for corners and couches. I really haven't found any negatives to bring out, so it comes as no surprise that I think this would be a good choice for anyone in the market.
I would recommend this to a friend - Cons mentioned:Dust bin size
Rated 1 out of 5 stars
Shark
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Does not pick up trash good. Get discharged really fast
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Daniel,
Thank you for sharing your experience with the Shark Clean & Empty Cordless Stick Vacuum. We're sorry to hear that the vacuum's pickup performance and battery life haven’t met your expectations.
We understand how important reliable suction and long-lasting battery performance are, and we appreciate your feedback. If you’d like help with troubleshooting or tips to improve performance, our team would be happy to assist. Please feel free to reach out to us at 1-855-427-5127.
Kind regards,
Shark Clean
- Pros mentioned:Suction power
Rated 1 out of 5 stars
Already falling apart
||Posted . Owned for 4 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Wouldnkot recommend very flimsy but suction eas good
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello,
Thank you for taking the time to leave a review.
We're so sorry to hear that your Clean and Empty was damaged. Please reach out to our team by phone at 1-855-427-5127, we'd be happy to look into this for you.
Kind regards,
Shark Clean
- Pros mentioned:Weight
Rated 2 out of 5 stars
Vaccum
||Posted . Owned for 1 week when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Its light weight but doesn't have powerful suction
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello,
Thank you for taking the time to leave a review.
We're so sorry to hear that you aren't happy with the suction on your BU3521. We will absolutely share your feedback with the relevant teams for consideration on future products.
Kind regards,
Shark Clean
Rated 2 out of 5 stars
More like a minnow
||Posted . Owned for 3 weeks when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Over priced and under performing. Wish i never purchased.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi dear customer,
Thank you for taking the time to share your feedback on the Shark Clean & Empty Cordless Stick Vacuum. We’re sorry to hear it hasn’t met your expectations. That’s not the experience we aim to deliver, especially with a product designed for both convenience and powerful cleaning.
We’d really like to understand more about the challenges you're facing and see how we can help turn things around. Please don’t hesitate to reach out to us at 1-855-427-5127, and our team will be happy to assist.
Kind regards,
Shark Clean
Rated 2 out of 5 stars
Worked good, but wouldnt charge
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Used once then Couldnt get this to charge at all. Maybe i got a dud. But returned and went back to dyson, which i have never had an issue with
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello,
Thanks for sharing your experience with your Shark Stick Vacuum.
We're sorry to know that you had issues with the battery life, and for this reason you decided to return it. This is not the experience we want our customers to have, especially on a recent purchase. We will absolutely share your comments with the relevant teams for consideration on future product improvements, and we hope you’ll give our products another try in the future.
Kind regards,
Shark Clean
Rated 1 out of 5 stars
Not so great
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.It’s very heavy and gets full really fast. Disappointed in my purchase and ended up returning it.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Kazandra,
Thank you for sharing your experience. We’re truly sorry to hear that the product didn’t meet your expectations. We understand how disappointing it can be when something feels heavier than expected and fills up quickly, especially when it doesn’t meet your needs. While it's unfortunate to hear this led to a return, we genuinely appreciate you taking the time to share your feedback. It helps us better understand what matters most to our customers and guides us in improving future designs.
Kind Regards,
Shark Clean.
- Pros mentioned:Ease of use, Suction power, Weight
Rated 5 out of 5 stars
This Shark - Will Swallow Your Dust Whole!
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.The Shark Clean and Empty Cordless with Automatic Empty system is an excellent, light weight system, equipped with LED lights, multiple attachments, and a simple storage/automatic self cleaning system. Here's a breakdown of the pros and cons: Pros: - Easy to assemble and use. - Lightweight and maneuverable. - LED lights for better visibility. - Powerful suction, especially on highest setting. - Self-emptying system for hands-free convenience. - Large-capacity, bagless dustbin. Cons: - Flimsy neck attachment - Cheap-feeling attachments, especially dusting brush and extension hose. - Short battery life on highest suction setting. The Shark Clean and Empty Cordless Stick Vacuum with Auto-Emptying System lives up to its name in terms of ease of use. Assembling the vacuum was a breeze, and the charging station's blinking light clearly indicates charging status. The lightweight design and smooth gliding motion make cleaning effortless. The powerful suction, especially on the highest setting, easily picks up pet hair, dust, and debris from both hard floors and area rugs. The LED lights are a game-changer, illuminating dust bunnies and dirt. The automatic emptying function is a major perk. Simply docking the vacuum in the charging station triggers the automatic emptying process, eliminating the need to manually empty the dustbin after every use. The large-capacity, bagless canister is easy to remove and empty when full. However, there are a couple of limitations to keep in mind. The neck attachment feels flimsy and may not be very durable, especially with rough handling. The included attachments, particularly the dusting brush and extension hose, feel somewhat cheap and could be improved. I found that both attachments did not clean well while I was cleaning furniture, and high places, such as my crown molding, without having to go over the areas multiple times. Finally, the battery life on the highest suction setting is on the shorter side; around 12 minutes. While the normal suction mode works decently, it may not be as effective for deep cleaning. Overall, the Shark Clean and Empty Cordless Stick Vacuum with Auto-Emptying System is a good option for those looking for a convenient, lightweight vacuum with powerful suction. However, the flimsy neck attachment and short battery life on the highest setting are limitations to consider.
I would recommend this to a friend Rated 1 out of 5 stars
Don’t buy
||Posted . Owned for 3 weeks when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.The vacuum had to be returned twice. It worked for the first few days then just stop having suction power. It was o Lu used on a dry floor picking up dust and some cereal. Very disappointed
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hello Lisa,
Thank you for taking the time to leave a review.
We're so sorry to hear your Shark cordless vacuum was not working fine and you returned it. We will absolutely share your feedback with the relevant teams for consideration on future products.
If there is any assistance needed, please contact our specialised team at 1-855-427-5127.
Kind regards,
Shark Clean
Rated 1 out of 5 stars
Handle Broken
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.It’s already broken, the material isn’t sturdy enough, I’m it’s the type of plastic and adhesive used for part assembly prior to distribution. I’ll surely have to return.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi dear customer,
Thank you for sharing your feedback on the Shark Clean & Empty Cordless Stick Vacuum. We're sorry to hear that the material and construction didn’t meet your expectations and that the product has already broken—this is certainly not the experience we strive to provide.
We understand how frustrating this must be, especially so soon after purchase. If you’re still within your return window, Best Buy’s customer service can assist with the return process. If you'd prefer to explore support or warranty options directly with us, please don’t hesitate to give our team a call at 1-855-427-5127.
Kind regards,
Shark Clean
- Pros mentioned:Battery life, Suction power, Weight
Rated 4 out of 5 stars
Very Nice
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.My new Shark Clean & Empty Cordless Stick Vacuum arrived very well packaged. I was happy to see that a crevice and brush attachment were included with the vacuum. I have three other Shark vacuums and Shark is great. I especially love my corded, bagless Shark because it is so easy for me to manage as an elderly disabled woman. It does an excellent job cleaning deep into my carpets. I have two other Shark sticks, one for our vacation tiny house and one for quick spot cleans around the house. I replaced the batteries on both just this year and they still work great. When I saw this new technology I really had to try it. We set the cleaning/charge station in our laundry room because it is pretty large and not something I wanted to leave out in the open. The vacuum was fairly easy to put together but we did need the quick start guide to refer to. I downloaded the owners guide from the website, although it was basically the same info. Oddly there is no good place to store both the included attachments which is annoying. There is a place on the stand for the crevice attachment but it will not stay in place. We plugged in the station and placed the vacuum on it to fully charge overnight for the first time. I immediately noticed that the handle/battery placement is very awkward. It sits below the on/off control switch and the boost button causing me to need both hands to start, stop or turbo boost. I noticed my husband was able to extend his thumb enough to reach the controls with one hand. As noted, there is an option to boost the cleaning power next to the power switch and an led battery life indicator. We noted in our test run that the battery began flashing to charge after less than 20 minutes run time in a combo of boost and eco power. There are led lights across the face of the floor attachment and the indicator lights blue in eco or low suction mode and magenta in boost, higher suction mode which is needed to get carpet clean. We have low pile rugs, deep plush carpet and tile floors. The vacuum transitioned easily between the tile and carpet. I noticed there was, at times, a several second delay between the change from tile to deeper carpet. It also switched back and forth on my low pile rugs as though confused at times about the suction needs. This vacuum is lightweight and very flexible with a good ability to get under furniture and around corners. The collection chamber is noticeably smaller than my other vacuums thanks to the new technology. In my limited testing it never came close to filling up. When I placed it back on the cleaning charger it pulled everything out in just a few seconds and began charging. I love that the next time I need it it will be fully charged and empty, ready to hold the dirt from my next clean up. We did empty the charging base canister just to see how it worked. It will easily hold several cleanings before it needs emptying. It is a very nice vacuum for quick clean ups but I still need my corded Shark for whole house and deep cleaning. Other takeaways, the cleaning/charging station is large. You still have to empty the dirt, just not as often. This vacuum does a good job cleaning and is light weight but the battery won’t clean my whole house on a single charge. This is great for a light, quick clean up.
I would recommend this to a friend - Pros mentioned:Battery life, Suction power, Weight
Rated 5 out of 5 stars
Lightweight Vacuum with some serious suction power
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.Shark is a vacuum brand I am very familiar with. I’ve owned about 3-4 different vacuums from them and always been pleased with the quality versus the price point versus a Dyson vacuum. They may not look as fancy as a Dyson but they always get the job done. The newest addition to my collection, the Shark Clean & Empty Cordless Stick Vacuum & Auto-Empty System is probably the lightest vacuum I’ve ever owned with a whole lot of suction power to boot! Unboxing and setup of the vacuum was easy and straightforward. The vacuum has a white finish that resembles a higher end product like something Apple would make. The weight of the vacuum completely assembled is impressively light. It’s so light my 2-year-old toddler has no problem holding it and operating it. The vacuum comes with a storage base that also doubles as a container for the dirt you pick up and doesn’t allow it to seep back into the air you breathe. It allows you to store the vacuum easily and dispose of any waste when you hang it up. My son was memorized by watching the dirt get sucked out of the tube and magically disappear. When vacuuming there’s 3 modes Auto, Power Boost and ECO. In Auto mode the vacuum does a good job detecting between hardwood floor and carpet and varying up the intensity based on the floor type. Downstairs I mainly have all wood flooring and area rugs and it did a good job picking up pet hair off my area rugs and is overall easy to use because of the light weight of the vacuum itself. The light is a nice feature as well to see what you’re vacuuming on a hardwood floor Suction power is good on Auto or even better on the power boost mode. Battery life is sufficient to do the job around the entire first floor on one charge and having the base to charge makes it easy to never really run out of juice. 2 additional tools were given for the handheld mode a crevice tool and a dog hair tool. I used the crevice tool to try and vacuum out my car and it did a solid job but not as good as a detailer vacuum obviously. Overall, I’m impressed with this Shark vacuum. It’s by far the lightest vacuum I’ve ever owned while still being powerful enough to get the job done around the home. The ergonomics of the base and storage of the debris while charging is genius. I could vacuum with this Shark all day and never get tired which is something I probably shouldn’t tell my wife cause then she’ll expect me to vacuum all the time. I really recommend this vacuum for anyone looking for a portable option with solid battery life and suction power!
I would recommend this to a friend













