purchase the Motorola sb6121 cable modem in March 2012 . I have have it for over four month now and i have no complaint about it be performance . I purchase this modem to replace my moto 5101 docsis 2modem , right off the bat i notice the difference , very quick my web page change in the blink of a eye wow . I now have two bond channel , send and receive lead 's be blue , the link light be flash blue so i ` be operate in high - speed gigabit ethernet base t mode . I have not have one issue with this modem , I love it , what more can i say . I love thing that work right out of the box .