bottom line : this be a great modem and it work with Comcast . Comcast just do not have its act together . this modem be not only on they approve list , it have a three star rating , which , accord to Comcast , be `` the highest and most thorough level of testing . '' when the cable installer get here -lrb- I get a new line install -rrb- , he say that this modem be not on the Comcast list . since I still have my dsl line work , I show he that not only do Comcast approve the modem but that Comcast thoroughly test it . he have to call the `` office '' to activate the internet service . the `` office '' do not want to set up internet service for this modem ; the `` office '' state that this be not a approve modem . well , he recall the `` office '' and get someone else and they set up the service . I have be happy ever since . I be suppose to get up to 20 mbp download and 4 mbp upload . my computer be connect wirelessly . Speednet state that I be get 20 to 25 mbp download and the upload speed be between 3 and 3.5 mbp . I have get similar value with speakeasy and other internet speed testing site . I have a lot of device connect : three computer -lrb- wireless -rrb- , two tv -lrb- one wire , one wireless -rrb- , three different game console -lrb- connect to the wire tv -rrb- , two Nintendo 3d -lrb- wireless -rrb- , one printer -lrb- wireless -rrb- , and a ipod touch -lrb- wireless -rrb- . at time all of these device be run at the same time - the computer be streaming you Tube video , one of the tv be streaming Netflix , etc. . the modem handle all of it effortlessly . I be really please with this modem .