Motorola SB6120 DOCSIS 3.0 Cable Modem

Decent modem/router for smaller, more open residences. Worked great for 2 years, then started to have issues with it when it had walls and appliances to send a WiFi signal through. You’d probably be better off getting the modem-only version of this and a good router.

Does the job and saves on rental fees for provider’s equipment.

Rock-solid after all these years. I’d give it a 6/5 if I could.

5 years and still kicking. I’ve since upgraded but I gave this one to my father and he loves it. Way better than anything you could get from comcast.

This has been a reliable workhorse in our household, no issues.

I love having this modem and not having to pay Comcast a monthly rental fee!

It works just fine

Once connected it said there wasn’t much life left in it.

Bought it years ago. It saved me a lot of money over renting Comcast’s unit. It still works, I’d buy another and recommend it to a friend

Great product. Fast delivery.

THEY ARE WORKING SUPERLY

Works. But still need to unplug and reconnect every few days to refresh, to continue work for internet connection. Includes cable, power line all have to be reconnected.

Works well, better than renting from Time Warner.

very good

I have had this modem since 2009. Lived in 5 different places. Worked great at every location. Xfininty/Comcast supposedly don’t support this modem anymore but mine still works.

Very reliable and have been problem free since day one.

great product

Fast

I bought this thing in September of 2010 (6+ yrs) . It’s still going strong and works just as well as the newest tech. I was looking into getting a new just because of its age but did a little research and decided there really was no need to replace it.

Worked well for a few years, then it quit. I expected longer life from it.

Comcast will not support this modem anymore. They have added it to the end of life list and force you to upgrade. I wish I could upgrade my internet service…We don’t have much for options in my neighborhood.

I’ve owned the same modem–in its Arris SB6121 formulation (they made this one under license with Motorola as well)–for years. These are both 4×4 (download/upload Docis 3.0 channels). They are all one needs for 100mbs+ download service. (I’m skeptical of claims of 150mbs, but 120mbs+ should be easily and consistently achievable, with the corresponding cable internet service package.But nobody should be buying this item new anymore. First, Comcast (and soon perhaps others) are sketchy about “provisioning” it (aka, setting up to work) on their networks. They’ve “grandfathered” those of us who have them–but some of their customer service reps are confused about this. I was having a problem with my Comcast internet service delivering pathetic speeds (10 times lower than my plan), and was fortunate enough to “chat” with a competent tech who managed to get my SB6121 set up to operate consistently and reliably at 90mbs/down/12mbs up (which is faster than my plan!). But even he suggested I start looking around for another modem “in a few months” since this one may not be replaceable on their system.Besides, you can get a much better, twice as fast, 8×4 Zoom model 5340 for half the price of this one! Zoom 8×4 Cable Modem, 343 Mbps DOCSIS 3.0, Model 5345. It has a 4.5 user rating. BTW, Zoom now has the Motorola license and builds their modems . . . If you’re really trying to stretch a buck, buy a USED one of these (or the SB6121, which are available all over the place, including here, for like $20). That way, if you cannot get your ISP to provision it, you’re not out too much dough.

The best modem that I had bought. Bought it 5 years back and it is still working solid.

Lasted only til late 2016

With Comcast it pays off in 3 months.