make the jump to light speed with this modem and what a difference . have a problem get up and run and I think that be because the Comcast software only give you the choice of they modem to install with . have to call they twice . second time it be a snap to get go . use Netflix with my AT&T; dsl take forever to load . clarity be not great either . with my Cable dsl through this modem it movie start almost immediately and the clarity be HD quality . best yet , I be not spend $ 5 per month to lease they cable modem ! if I have to do all over again I would get up and run use the Cable company modem then switch the next day .