Works as advertise . I would be rent the standard Comcast internet cable modem for the last several year . now that I be not be reimburse for monthly internet expense I decide to checkout what modem Comcast support so that I can purchase instead of rent . Comcast identify this modem as support . I decide to spend a little more since it be already DOCSIS 3.0 and can support higher speed if I upgrade my bandwidth . it take several time to get the modem completely activate through the Comcast web site and setup process . I tire the activation process use Chrome but have some problem . when I switch over to ie and after have Comcast re-initialize the modem it be be work great ever since .