my first option be to buy a Arris WBM760A as part of a new setup to replace a unreliable surfboard sbg6850 but it be not be sell anywhere but ebay for more than I would like to pay . after receive the Ubee 3513 from Amazon , Comcast could not activate it and have try different method to activate it without success . I have lose hope and almost return the Ubee to Amazon until I come across someone on the internet mention that they have activate they modem by use Comcast 's activation page . I give it a try and presto ... activation success ! so if you be have difficulty as I be , try comcast.com\/activate so far , the cable modem have be great . there be no drop or reset . I also have a Motorola SBG6580 that constantly reset ... stay away from the sbg6580 as many have say of its problem ! Update : recently I find out why the ubee have trouble set up with Comcast when I request a technician to do a final check to see if my internet connection be good . when Comcast try to setup the ubee , they system do not expect a customer to own a ubee modem so it will not setup . now if you use the online setup , the modem will be setup but however as a Netgear modem . as a Netgear modem , there be no functional issue as it may have the same chipset as the ubee modem . this be the best way to set this modem up and then leave it that way . be careful if you have a Comcast tech set this modem up as a ubee , you will be charge the rental because Comcast detect ubee serial number as belong to Comcast . now I have a problem with Comcast to straighten out because the tech setup my ubee modem as a ubee modem instead of leave the modem as a Netgear modem . -lrb- see update below , maybe you can setup the ubee modem the right way by call Comcast ? -rrb- Update : in regard to Comcast modem rental charge ... my local Comcast store can not help with the rental charge . I call Comcast billing today to tell they that I own my ubee modem and that I be be charge the rental . all they do be ask for the modem serial number and mac address , and without further question correct the problem and refund my rental fee . Sweet ! we 'll see when my next bill arrive . 3-8-12