this modem work like a charm . I buy this to replace my Comcast rental . I have to call Comcast and give they the MAC ID that be on the box of the modem . afterwards , the installation be a breeze . I just plug in the coax and then power it on . when all the light stabilize , it be good to go . stabilization take about 5-7 min . I actually get 1.5 time more speed than my previous modem .