have read through all the previous review , be a bit concerned I would have to be on the phone with Comcast all night get this set up . not true . plug it in , attach Apple wireless router , call Comcast and give technician MAC ID , he say give it 10 to 15 minute , hang up phone - internet be work ! and at blaze speed , mind you . we have not think much about upgrade since we be not have any problem , per se -lrb- we stream music , play online game , surf , watch and record cable , etc - sometimes all at once -rrb- , but a friend at work have mention that he receive a letter from Comcast state he modem be out of date and suggest he upgrade to DOCSYS 3.0 . so we take the plunge too , since we could not recall how old we modem be . previously , streaming music would sometime have to re-buffer , Netflix streaming would cut out , would get disconnect from online game ... . we blame the provider at the time but no more ! not one problem with connectivity since we install this ! one bit of advice for Comcast subscriber - try to get to a Tech support person . I punch in that I have trouble with my internet , that get I to a technician ... since there do not seem to be a straight `` press 3 for tech support '' option . all he need be the MAC ID , which be on the device itself or the box it come in .