I buy this modem a couple of month ago , when Comcast send I a letter state that I need to upgrade to the DOCSIS 3.0 standard . I install and register it with Comcast use they self registration website . the process be fairly straight forward and I be now get download speed of around 25 mbp , and upload speed of around 4 mbp . so far , I be very satisfied , and would highly recommend this modem .