Bests & Worsts Reviews from Amazon

Swapped out my Comcast rental modem, was up and running in just a few minutes, and now I don't have to pay the $7 modem rental fee to Comcast. I'm provisioned for the 105/20 Mbps package and typically get 120/20.5 Mbps. This modem can utilize up to 8 channels of downstream for a theoretical max speed of 343 Mbps whereas the Motorola SB6121 and other earlier/cheaper DOCSIS 3 modems can only utilize 4 channels maxing your download speeds out at 172 Mbps. Just something to think about if you plan on using this modem for a few years as speeds offered will inevitably increase. Also, it *does* support IPv6 even though Comcast's page doesn't list it as certified yet. Motorola's data sheet specifically lists the SB6141 as IPv6 ready and tests with an Apple AirPort Extreme (v7.6.4) and MacBook Pro running 10.9 confirm this. Update 2/4/13: Still working great without issue. Update 3/25/13: Still not even a single reboot required. Update 8/28/13: Still working great... Update 7/8/14: First issue... had an outage for 15 min. Reset the modem and it didn't resolve the issue. Called Comcast, they reset something on their end and I was up and running again. First issue since I bought it. Update 4/5/2015: Comcast recently upgraded my speed tier and I'm consistently getting speeds up to 180/25 Mbps.