Customers express satisfaction with the MB7621 cable modem's ease of use, performance, and setup process, frequently citing positive experiences with installation and speed. Many appreciate its compatibility with various routers and internet service providers, as well as its reasonable price. However, some users reported occasional connection issues and noted the lack of built-in Wi-Fi functionality. A few also mentioned the modem's size and the need for sufficient channels for optimal performance.
This summary was generated by AI based on customer reviews.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Page 2 Showing 21-40 of 324 reviews
Pros mentioned:
Performance
Rated 5 out of 5 stars
Best modem
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Posted .
This reviewer received promo considerations or sweepstakes entry for writing a review.
Easy set up and activation. Price is very well priced. Runs cool and dependable.
I would recommend this to a friend
Pros mentioned:
Compatibility, Performance
Rated 5 out of 5 stars
Motorola Cable Modem
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Posted . Owned for 5 months when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
We have Comcast Xfinity cable system. Our old cable modem died! We looked on line and found that there are several models that Comcast/Xfinity has a "Do Not Buy list of Intel Puma Chip-set Defect" ! This does Not have the chip-set defect!!!! This works great!!! You have to do your research, it's on the web "Full Comcast Xfinity Approved Modem List"! This is a winner!!!! It does get warm, but we put a dedicated AC Infinity fan in front. Keeps it running cool! Cable modems degrade faster when it gets hot! Keep them cool with a fan in front! It's easy to set up any 15+ year old can do it! Even Seniors!
I would recommend this to a friend
Pros mentioned:
Performance
Rated 5 out of 5 stars
Works well with EERO PRO 6E
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Posted . Owned for more than 2 years when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
This is a very good router. It works with comcast in the Chicago suburbs well with no lagging or issues. I am using it along with the EERO pro 6E mesh system and works well
I would recommend this to a friend
Pros mentioned:
Speed
Rated 5 out of 5 stars
faster
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Posted .
This reviewer received promo considerations or sweepstakes entry for writing a review.
I needed a faster modem because my internet speed was higher than my old modem that I have had for a few years. So I looked at a few models and chose this one for speed and price and it works great.
I would recommend this to a friend
Pros mentioned:
Ease of use
Cons mentioned:
Wifi
Rated 5 out of 5 stars
Great router, perfect to save from Comcast router.
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Does the job for a great price. Easy to setup. This does not have WiFi so you need a separate WIfi router. The only thing that bothers a little are the lights that are too bright, so you will probably want to install it in a place that won't be in your face, especially at night. But I definitely recommend it.
I would recommend this to a friend
Pros mentioned:
Ease of use, Speed
Rated 4 out of 5 stars
The modem for work-at-home
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
I bought this modem to replace the one from Comcast/XFinity. According to the product specification, it does handle the speed rate that I need for my work-at-home environment. It is pretty easy to install, plug-in, turn on the device, and that simple. So far, I am happy with my purchase.
I would recommend this to a friend
Pros mentioned:
Performance, Setup
Rated 5 out of 5 stars
Easy set-up and works great
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This reviewer received promo considerations or sweepstakes entry for writing a review.
I'm using Comcast Cable and upgraded to this modem to take advantage of increased service speed. Set-up was easy by attaching modem and then accessing website requiring no need to call Comcast Customer Service. To this date it has not required a reset or reboot. Very pleased with its performance.
I would recommend this to a friend
Pros mentioned:
Compatibility, Setup, Speed
Rated 5 out of 5 stars
Recommended!
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Posted . Owned for 2 months when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
This is a really good modem. It is rated up to 1000 Mbps so it should be great for any internet plan up to 600 Mbps, possibly good for 800 Mbps, but wouldn't be great value for 1000 Mbps considering modems do not hit their theoretical speeds. Setup was easy, although not exactly speedy, and make sure you have your ISP login info ready to go. Works seamlessly with our Orbi AX4200 mesh Wi-Fi system, for nearly three months now.
All in all, highly recommended for anyone that doesn't need Gigabit internet, which probably is most people. We looked at DOCSIS 3.1 modems but ultimately decided to keep our modem spend under $100 and instead spend a little bit more on the router/mesh Wi-Fi system.
I would recommend this to a friend
Pros mentioned:
Performance, Speed
Rated 5 out of 5 stars
Great modem
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Works great connecting with Netgear Nighthawk x10 router. It's been running for a month with no issues, no disconnect, and no reboots. Test speed on router and getting around 700MB download with 17MB upload.
I would recommend this to a friend
Pros mentioned:
Compatibility, Performance
Rated 5 out of 5 stars
Great!
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This reviewer received promo considerations or sweepstakes entry for writing a review.
Great little modem! Works well with comcast. Is not wireless, but not an issue, as have a wireless router anyway. Does the trick and great price.!
I would recommend this to a friend
Pros mentioned:
Ease of use, Performance
Rated 5 out of 5 stars
Solid performance
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Set up was quick and this modem has been a solid performer, handling with ease multiple streaming devices, work from home video conferencing, and educational platforms. At the time, it is Wirecutters #1
I would recommend this to a friend
Pros mentioned:
Speed
Rated 5 out of 5 stars
Using with Google Nest Mesh Router + Point
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Replaced an old Netgear combo modem/router. Used in combination with the Google Nest Mesh Router + Point, it's no competition. With 400Mbps service, we used to get buffering, fuzzy video, and general internet slow-downs all the time. Since switching up our home network stuff with this gear, it's been nothing but fast, smooth sailing.
I would recommend this to a friend
Pros mentioned:
Ease of use, Setup, Speed
Rated 4 out of 5 stars
Good modem. Does as it says.
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Posted . Owned for 1 month when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Works as expected. Simple setup, accurate speeds. Good value for price.
I would recommend this to a friend
Pros mentioned:
Ease of use, Setup, Speed
Rated 5 out of 5 stars
Great Modem It delivers
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Posted . Owned for 1 week when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Works as advertised. Easy to set up as an Xfinity customer using their app. Connect a router, and away you go. I replaced an older Motorola modem router that worked fine but no longer supported my speed. This modem immediately improved my router speed to the speed I was paying for. If you don’t need voice support, or 3.1 DOCSIS to get 1gb speed, this is the modem for you. Great price, I strongly recommend.
I would recommend this to a friend
Pros mentioned:
Speed
Rated 5 out of 5 stars
Great cable modem
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This reviewer received promo considerations or sweepstakes entry for writing a review.
Everything is working fine. I was tired of renting a modem from Cox Cable. They do not deserve any extra money from me. I wish we had a second choice for high speed internet in my area. I would switch in a heart beat. Modem is doing great !!!
I would recommend this to a friend
Pros mentioned:
Ease of use, Speed
Rated 5 out of 5 stars
Great speed
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Posted . Owned for 1 month when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Due to work from home and remote learning for high school student I increase my internet speed. So this required a high speed modem. Easy to setup and increased download speeds significantly.
I would recommend this to a friend
Pros mentioned:
Speed
Rated 5 out of 5 stars
Great Modem for Xfinity 600mbps plans
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Posted . Owned for 1 month when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
I use Xfinity/Comcast as my ISP. I Upgraded my plan from 150mbps to 600mbps which I had to upgrade my Motorola 16x4 686mbps Modem as it only supported up-to 300mbps from Xfinity. After upgrading to this modem I were able to enjoy full speed for what I pay Xfinity for.
Pair This with a Router and you can save yourself equipment fees for Xfinity Router.
It basically pays for it self.
I would recommend this to a friend
Pros mentioned:
Speed
Rated 5 out of 5 stars
Works great
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
I upgraded my xfinity service from 200 to 600 Mbps and needed an upgrade in modem. Bought this and it's worked great right out the box. Did the online xfinity setup and my my speeds are greatly improved. Am getting over 600 ethernet direct connect to computer and about 350 Mbps on 5Ghz band on my phone thru a AC1900 router. Getting over 200 to an old computer in basement. Overall, happy.
I would recommend this to a friend
Pros mentioned:
Performance, Speed
Rated 5 out of 5 stars
Highest of speeds
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Posted . Owned for 3 weeks when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
Performs as expected out of the box and able to handle full range of internet speeds.
I would recommend this to a friend
Pros mentioned:
Ease of use, Speed
Rated 5 out of 5 stars
Easy install, performs faster than advertised spec
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Posted . Owned for 1 month when reviewed.
This reviewer received promo considerations or sweepstakes entry for writing a review.
I upgraded my modem to take advantage of the Xfinity internet speed package of 600 mbps download and 20 mbps upload. This is much more than I need for my home network (wired and wireless). Super easy to setup. Contact with Xfinity needed for them to activate the new modem to their network but this took only a few minutes after a brief talk with an extremely helpful service rep. He processed the needed info and it was as fast as turning on a new light in the room to have me up and running at the faster speeds when he completed his input. Running speetest.net I always get better than 700 mbps upload and 20 mbps download. No problems using the new modem.