I buy this modem to dump the one Charter give I initially -lrb- and be charge I $ 10 a month for -rrb- . set-up go smooth , though I do have to call Charter and get a tech to help activate it , but they be very helpful , and say this be a great modem to be use with they service . now I have save $ 10 a month off my service , which should pay for this modem -lrb- and router I buy at the same time -rrb- in a year . we test throughput and with doci 3 it be great , so I be pleased so far .