I replace a older sb 5101 because my internet speed be lack . I have Comcast and be suppose to be get at least 15 mbp down and 2 mbp up . I be get at best 2 mbp down and .5 mbp up . I set the new modem up and immediately I be achieve between 15 and 20 mbp down and 7.5 up ! very easy setup , take less than 15 minute even with call Comcast . I give it a 4 because there be always room for improvement , like the ability to place the modem in standby or have a disconnect button without have to unplug it .