So pulled plug and after verifying supported modem for their 400Mbps plan, and the great price for the Broadcom chip

I bought this cable modem because the price was right for the speed I need, and so far I'm not disappointed

This new modem is good to a top speed of 1000 mbps, which we'll never need, but, for the great price and future update (firmware and support) capabilities, this modem is a keeper for sure!5 stars all around!

Well worth the price and if you are renting a modem from your

Good modem, good price, very easy to install, Xfinity picked up the signal right away

Only took about 5 minutes to set up pretty much plug and play and so far it is working as expected.

The modem works as expected I don't believe the problem is with the model I fully believe its their spotty serviceI upgraded from Surfboard to Model MB7621, DOCSIS 3.0 100MB to 600MBoptimum service is 300

Setup was easy, I followed the instructions that came with the modem

Works as expected, easy setup on XFinity service, haven't had a single issue with it

Easy setup and fast connections to the internet instant activation with Xfinity

Replaced my old Motorola cable modem and setup was easy with Comcast.

The setup was very easy and my ISP was able to connect almost immediately

Their tech support is very slow to respond to inquiries

The Motorola was recommended by tech support from my cable company.

Couldn't comment on tech support as I have not needed it

wanted to use with the switch but was hard to configure and even tech support had an issue with it working they got it to

If you have spectrum, you will have to call tech support to activate this for you

Installation was easy: I hooked the cable feed to this and then called my Internet provider (xfinity) and had them activate the new hardware

Installation was an all-afternoon nightmare

First of all this is a great modem and installation is a breeze.

The installation was a breeze, it’s really just plug and play

Cable providers want you to rent theirs, a lame-o cheap model at a premium monthly charge, AND....they want to send that $100 technician out...try everything you

Cox told me the serial number is not one issued by Motorola and the serial number is not in the format for the MB7621.Cox then told me the signal was sent to the modem but the modem couldn't read it

No service issues, easy to connect to Comcast and internet speed are extremely fast.

No issues, cheaper than renting in long run.

Can technically support 1GB/s, but rated for up to their 600Mbps plan

Router works great no issue so far but when I activated with Comcast I was told this product is at end of life cycle and might have problems later on.

I was having random loss of internet after installing this and also a new TP-Link router, but the lights and signal on and from the router where constant and stable as they should be

Would have been an easy install, if you dint have to call COX to set it up as a unit

This modem was very easy install just plug and go and wow

Initial install was easy and this worked fine for the first couple of weeks.

At first the install did not work, but that was due some old filter that was in the cable box outside my home

I bought a Netgear modem first and had to return it because our internet would just stop working for 5-15 minutes...so annoying

Working for 5 minutes, dead for 10 minutes, working for 3 minutes, dead for 6 minutes, etc.

I got the modem and it was working great for like a day or two, but then the internet in my apartment just stopped working

My old Surfboard 6141 had seen its last and this one worked great right out of the box, but soon it would start dropping the internet connection a few times a week

I have COX for my internet and this cable modem works great with it.

The weak physical connection to the coaxial is something I can deal with, but the fact that it gets nowhere close to the advertised download speed for the specific provider is just blatant false advertising

After getting it set up with COX it worked as advertised, things per specs, then the next morning I went from 110Mbs to 10Mbs, lots of chat with COX, they too had slow speeds

So overall the product works as advertise, its just dealing with the IP/cable company the reason it isn't given 5 stars.

and he could not get this modem to work with their system, despite stating -- as advertised -- it works with their service.

I'm giving this just 1 star based on false advertising

However, the performance I saw was much worse than the older SB6141 with download speeds.

Cable providers want you to rent theirs, a lame-o cheap model at a premium monthly charge, AND....they want to send that $100 technician out...try everything you

Replaced my cable carrier’s modem for cost saving and better performance

Overall very pleased with my purchase and would highly recommend this modem to anybody that wants solid performance and doesn't want to be stuck paying a rental fee every month

Then I upgraded to 300Mbps and still didn't any better performance.

Upgraded my trusty old Motorola SB5100 that still works well and has lasted me well more than a decade

Upgraded my trusty old Motorola SB5100 that still works well and has lasted me well more than a decade

The Motorola was recommended by tech support from my cable company.

Cable providers want you to rent theirs, a lame-o cheap model at a premium monthly charge, AND....they want to send that $100 technician out...try everything you

Cable providers want you to rent theirs, a lame-o cheap model at a premium monthly charge, AND....they want to send that $100 technician out...try everything you

great product works perfectly, downloads are now faster and I can now take full advantage of my 200Mbps internet connection

great product works perfectly, downloads are now faster and I can now take full advantage of my 200Mbps internet connection

After repeatedly telling me to contact Intellicast, they finally admitted the product was defective.

First, I believe Motorola makes good and reliable product which is why I purchased the MB7621 cable modem

Only issue was not a product one—shipment was to arrive in one day based on Prime membership, but arrived the following day

Easy install and connection to my internet provider just took a phone call

I need a stable connection because occasionally I work from home as well

So far, things are going well and connection has been stable and fast

After a month of connection issues and constant buffering issues I went back to my old modem and all is right with the Universe again

The modem loses connection and has to be restarted multiple times a day.

Slowly it began dropping internet numerous times a day, to the point where it drops internet at least 5-10 times a day and a hard reset requires a reconnect.

Slowly it began dropping internet numerous times a day, to the point where it drops internet at least 5-10 times a day and a hard reset requires a reconnect

By chance, Google suggested "hard reset" Apple Time Capsule and voilà

Can technically support 1GB/s, but rated for up to their 600Mbps plan

So the tech went back outside and found a bad connection on the house box, came back did a hard reset and it came to life

I told them that the label has a "CM MAC" number and I asked them if that was what they were looking for.

I called and gave them the mac number and two days later had a tech visit house as he had to run new cable from the street

After a wild goose chase of scouting around for some mysterious "MAC" number, I was unable to find any others they were looking for.

Works as

They come back on, only to then apologize and to tell me that the router label's "MC MAC" number was in fact the same as a "MAC" number that they were asking for to begin with.

I spent 1.5 hours on the phone waiting to talk to technical support, after they ignored the email I sent.

The "Magic 12 hour cycle" for me was 9am & 9pm

I wasted almost 2 hours first troubleshooting this modem, then calling xfinity

We wasted 4 hours on the phone with Comcast thinking it was an issue on their end

Anyway, after the hour long fiasco, it was activated by my cable service provider and was then up and running smoothly and ever since

(-/+ 5 minutes, the modem would loose its IP and my router behind it would report, "ISP DNS/DHCP configuration error".I travel and also remote office ( even prior to COVID-19)

Losing the IP, reboot....and repeat

I get about 650Mbps down which is my rated speed from Comcast after upgrading to this from an older one that maxed out around 250.During activation, make sure you connect directly to it from your pc and set your pc to dhcp if you are using a static IP.