Customer Ratings & Reviews
- Model:
- BU3521
- |
- SKU:
- 6583331
Customer reviews
Rating 4.5 out of 5 stars with 312 reviews
(312 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 often highlight the Clean & Empty Cordless Stick Vacuum's lightweight design, strong suction power, and ease of use. Many are happy with the overall performance and appreciate the good battery life and convenient auto-empty feature. However, some customers have noted that it does not pick up trash well.
This summary was generated by AI based on customer reviews.
- Pros mentioned:Ease of use, Suction power, Weight
Rated 5 out of 5 stars
Shark Cordless Vacuum Clean & Empty Stick is Magic
|Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.The Shark Cordless Clean and Empty Stick Vacuum plus Auto Empty System is what I have been looking for in a Stick Vacuum. Convienent and quick usage with maximun suction of cleaning of dust and debris. It was as easy as 1,2,3 to set up and put on the charging Dock for the night to fully charge before the first use. I first used in Auto Mode going from the livingroom carpet to the kitchen hardwood floor and the auto adjust from Magenta to Blue color is really cool. The Shark Stick Vaccum is very light weight and and moves across the carpet so effortlessly in quickly picking up dust and debris. You can toggle between Eco, Auto and Boost selections but Auto does not work in Boost Mode. In Boost Mode that I will be using for the bedroom in hard to reach underneath the bed places where dust gathers a lot. The Handheld Vacuum is an extra bonus to have with easy access that includes detachable Service and Pet Multi Tool. The Shark Cordless Stick Vacuum Auto Empties immediately and sucks the dust and debris from the Vacuum Stick as soon as you place it back on the Dock dust bin. Once the Stick Vacuum is empty it starts charging back again. I just love the simplicity and power cleaning all packed together in The Shark Cordless Clean & Empty Stick Vacuum plus Empty System.
I would recommend this to a friend Rated 5 out of 5 stars
Delivered as committed
||Posted . Owned for 1 week when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Best Buy Best Service ever received from any of the electronics stores
I would recommend this to a friendRated 5 out of 5 stars
Good buy
||Posted . Owned for 1 week when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Works well and efficient for cleaning the household
I would recommend this to a friendRated 5 out of 5 stars
Makes vacumming fun!
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.We use this daily! Best appliance I’ve purchased!!
I would recommend this to a friendRated 5 out of 5 stars
SHARK TASTIC
||Posted . Owned for 1 week when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.WORKS REALLY WELL I REALLY LOVE THIS VACUUM CLEANER
I would recommend this to a friendRated 3 out of 5 stars
Loved it while it last
||Posted . Owned for 2 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Had this product for 2 months and it stopped working Loved how it work but it’s not very trusted
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 are truly sorry to learn that your Clean & Empty Cordless Stick Vacuum has stopped functioning after just a few months of use, particularly since you were pleased with its performance and cleaning capabilities. Your satisfaction means a lot to us, and we want to make sure you have the best experience with your vacuum. Please feel free to reach out to us at 1-855-427-5127, and we will do everything we can to fix this issue for you.
Kind regards,
Shark Clean
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 5 out of 5 stars
Vacuum
||Posted . Owned for 2 weeks when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.Excellent product customer service was knowledgeable
I would recommend this to a friendRated 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
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 1 out of 5 stars
HORRIBLE CUSTOMER SERVICE
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.I"m giving it a 1 because their customer service is horrible. We have a defective part, which they acknowledged. But, not surprisingly they don't have the part in stock. So I can call in a month and follow up. They will not do any follow up nor send it if it comes in. Plus, because there is only a 90 day period for free shipping, although I've called within the 90 day period I will have to pay for shipping if it comes in later than 90 days. It cleans well but this type of customer service is not something I will deal with again.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Lynn,
Thank you for taking the time to leave a review.
We're genuinely sorry to hear that you've had a frustrating experience with our customer service regarding the defective part of your stick cordless vacuum, the warranty policy, and the stock availability for the replacement you need. Your disappointment is totally understandable, and we want to assure you that your concerns are being heard, so we'll absolutely share your feedback with the relevant teams internally for consideration on future service. Please don't hesitate to reach out to us at 1-855-427-5127 so we can explore more available warranty options for you and help ensure you're getting the most from your product.
Kind regards,
Shark Clean
Rated 3 out of 5 stars
Its okay
||Posted . Owned for 4 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.I think its okay. Could be better . Wish it can pick up m&ms or something lol
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 wish it could pick up M&M'S. We will absolutely share your feedback with the relevant teams for consideration on future products. Nevertheless, if you consider there's low suction, please don't hesitate to reach out to our team by phone at 1-855-427-5127, so we can help with it.
Kind regards,
Shark Clean
Rated 1 out of 5 stars
Don’t buy it
||Posted .This reviewer received promo considerations or sweepstakes entry for writing a review.I’m shocked this vacuum has any positive reviews. It has weak suction, smells terrible even with the self-emptying feature, and if you’re short and right-handed, the airflow blows directly into your face—disgusting. I’ve owned cheaper $80–$100 vacuums that worked far better. I usually love Shark products, but this one is a complete dud. Do yourself a favor and choose a different model.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi Kim, thank you for your review and for bringing these issues to our attention! We’re truly sorry to hear about your experience. You pointed out that the Shark BU3521 has weak suction, emits a foul odor even with the self-emptying feature, and that the airflow directly hits your face if you’re short and right-handed. This is not representative of our usual standards, and we completely understand how frustrating this must be for you. We genuinely value feedback like yours, as it helps us make improvements and enhance our service for you and others in the future. Best regards, Shark Clean
Rated 1 out of 5 stars
Not the best experience
||Posted . Owned for 1 month when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.The vacuum duct pick up items off the carpet well the first 2 times we used it. The 3rd time it started smoking so we returned. Cashier said it is a good brand so it may have been faulty. So may have been a 1 off.
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi there,
Thank you for sharing your experience with us. We’re truly disappointed to hear the vacuum began smoking on your third use. This isn’t our usual standard, and we understand how concerning and frustrating that must have been. Your feedback is really important to us, and we’ll be sure to relay this information to our internal team for future improvement. We hope you’ll choose to stay with us again so we can restore your confidence in our brand.
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
- 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 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, 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 Rated 1 out of 5 stars
Would not recommend
||Posted . Owned for 3 months when reviewed.This reviewer received promo considerations or sweepstakes entry for writing a review.It's meant for hard floor and carpets but when using to clean my hard floor theirs no suction and it doesn't pick up any small particles. I was disappointed
No, I would not recommend this to a friendBrand response from SharkNinja Product Expert
Posted .Hi there,
Thank you for taking the time to share your experience. We understand how disappointing it can be when a vacuum doesn’t perform as expected on hard floors, especially when it’s designed to handle both carpets and hard flooring. We recommend reaching out to our Customer Support team at 1‑855‑427‑5127 (Mon–Fri: 9 AM–9 PM ET | Sat: 9 AM–6 PM ET). They can help troubleshoot the issue, review your setup, and guide you through possible solutions to help restore proper suction and pickup.
Kind regards,
Shark Clean













