we have Comcast Xfinity and get this cable modem to replace a older one that we be rent from Comcast . we cable service be throttle by the older one and buy we own will have a payback versus the rental in less than 12 month . I should have pay attention to the itemize billing earlier and figure out how much we be spend to rent what we should have buy : - -lrb- this have be hook up since 10\/13\/11 and there have not be a hiccup since . between this and a Asus dual band wireless router we have two desktop on the network , a netbook and a Roku box . no problem with any of it even when streaming video on the televeision and youtube on the netwook .