I buy this before Comcast install my new service , but I could not get it to work at the time of my self-activation . I put it aside for a few week and come back to it . after have Comcast 's " Ubee " brand for a few week , which cap at 44mbp -lrb- we be suppose to have a 50mb line -rrb- , I decide to try one night to just plug in the Motorola to see what would happen . it take a while , maybe 20 minute and 5 reset , before the modem finally download the firmware it be suppose to which allow the Comcast " self-activation " screen to appear . after this point it be smooth sailing , though it take 30 more minute for the Comcast activation to work . the best part ? Speedtest now run at a solid 54.78 mbp ! I have run speedtest probably 20 time over the last week and it have never move off that number . that be get my money 's worth and also not pay Comcast for a slower modem .