Comcast charge $ 7\/mo . as a modem rental fee . since I sign a 1 yr . contract with they , I figure that buy a compatible modem would be cheaper for I . after do some research , I decide to go with this product . I have have it for a month now , and so far , I have be very happy with it . Technically , I only pay for 20mbp internet , but since this be a docsis 3 modem , I end up get about 25mbp when I be use wire internet . not a bad situation to be in : -rrb-