I purchase this cable modem recently as part of a switch from Comcast to astound -lrb- East Bay Service -rrb- and move up from 20 mb\/s to 50 mb\/s . the move require a doci 3 modem . although I have only be use this modem for about a month now , I have be use the same model at my brother 's house for almost 6 month and both be run great -lrb- he have Comcast service -rrb- . on astound I get about 35-38 mb\/s -lrb- Cnet -rrb- with a peak speed around 45mb\/s ; or , 42-45 mb\/s -lrb- speedtest.net -rrb- with a peak speed around 48mb\/s .