just finish install a refurbish cm100 on Comcast . very simple to do . call to Comcast just require the model and MAC . sixty seconds later I be surf again . speed be either the same or a little faster . I be already get 6 - 10mb download . after hang up with Comcast I recable my router back in and all computer be blaze . if you be pay monthly rental for modem I would strongly suggest buy you own . I can not believe I have be pay rent for at least 10 year . yike that be $ 3600 . do it now !