this cable modem have the highest compatibility rating with Comcast -lrb- http:\/\/mydeviceinfo.comcast.net\/ -rrb- , so I be not surprise that it work fine with Comcast Cable Internet . other than the led be a little too bright and distracting I could find no fault with it . whether you should buy this or not have little to do with the modem itself but rather whether it be worth it . you can rent a cable modem from most cable company for $ 5-7 a month . do the math , that be 11 month rent the modem for you to break even . consider that the DOCSIS standard have change only three time since 1997 , chance be the modem be good for many year . so , if you be plan on stay with cable internet for a year or more it be probably worth invest in one . however , if you own cable modem die , you 'll have to buy another one whereas , if you be rent , you 'll get a replacement for free . since most cable contract be for a year or more , invest in one of these seem to be a good idea . just make sure you cable company be not charge you for the rental of the cable modem when you be use you own .