I buy this because I be move to Comcast Internet , and I want a fast modem that would not give I any trouble . unfortunately , the first one keep power cycling when I get it hook up . I call Motorola tech support , who tell I that a low sigal to noise ratio be cause the power cycle . I call Comcast , and they tech come out and fix the low snr problem , but the modem keep power cylcing . he replace it with a Comcast modem , which work just fine . the replacement modem that I get work fine , but I be only rating this 3 star because of the hassle I have to go through get it to work .