I purchased the Motorola SURFboard SB6121 DOCSIS 3.0 Cable Modem as an upgrade from a DOCSIS 2 modem so I could take advantage of the higher 50 Mbps speed offered by my cable company. It was very easy to set up: I followed the directions in the startup guide, connected the ethernet cable, and contacted the cable company so they could complete the activation. (If one is setting up cable service for the first time, the steps may be a bit more involved, but the modem itself is not difficult). So far it is working just fine. It looks nice on the desk, doesn't take up a lot of room (it's "footprint" is about 1.5" x 5") and I like that the LED status lights on the front are little icons, so one can tell at a glance which is for power, connectivity, etc.
My previous modem was also a Motorola SURFboard product, and it was working fine after more than 18 months. As earlier mentioned, I only replaced it to be able to upgrade to higher internet speeds. With the cable company wanting $7.99 per month to rent a modem from them, it had already more than paid for itself. I fully expect this one will do the same.
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