isp : Comcast Comcast Internet Package : Performance -lrb- 15 mbp -rrb- Comcast provide modem : they `` latest DOCSIS 3.0 Arris '' modem Router : Linksys E4200 v1 the reason why I buy this modem be simple ... why pay $ 7\/month to rent a modem when I can buy one myself , with potentially better spec , and cost savings 10 month out . I find good review for this modem and figure why not , especially since http:\/\/mydeviceinfo.comcast.net\/ show that this specific modem be sign off as support by Comcast , along with they highest , 3-star rating . I can not be certain that the new Motorola modem be buy I speed\/reliability over the Arris modem , but I know that my wife and I have be run we computer and game console without a hitch . with the Arris modem , we find the internet to slow down several time a week require modem reboot , but maybe we be just get lucky . but hey , possible positive be a good thing right ? I be pay for Comcast 's performance package which claim speed of 15 mbp down . with the Arris I be see speed around ~ 17-25 mbp down . with the new Motorola I be see 20-25 mbp down -lrb- both much higher than expect -rrb- . I have see slow upload with both modem , but I think that be a Comcast thing . -lrb- random : I previously have fio 25\/25 and be get 30\/25 . those be the good ol' day -rrb- if you be use this with Comcast , remember that you be go to have to contact customer service and get they to send a signal to you new modem in order for it to work - do not expect it to be plug-n-play .