do not rent a modem from Comcast . this modem be much better than any that Comcast will rent to you at $ 8 a month ! the only drawback be have to call Comcast . it take I nearly a hour on the phone with Comcast and I have to talk to 4 different people , just to swap the old modem for the new one . but $ 85 and a hour on the phone with Comcast be still a deal . this be a excellent , state-of-the-art modem . if you use high-speed internet and\/or stream video , I highly recommend this modem . even if all you do be surf the internet once in a while and use email occasionally , I still recommend this modem .