I have only have this modem for a day , so it be entirely possible that it have problem I have not discover yet , but so far it be work great for I . I simply plug in the modem , bypass my router , and be able to configure the modem for use on Comcast in less than 10 minute . the online setup work great for I , I simply enter my account number and everything else be automatic -- Comcast 's site find the modem 's MAC address and I di not have to enter the serial number or any other information , just wait about 4 minute for Comcast 's site to process the information . I then turn everything off , re-connect the modem to my router , turn everything on again , and I be good to go . so far , this modem be significantly faster than the modem I be rent .