I replace a old Ambit unit which seem to be over heating and cause connection issue to the LinkSys cm100 and its be work great for the past few day . I have to call into the isp and have they provision the new modem with be MAC Address and then all be work great . I have notice it handle traffic great , my connection be consistent and most off all I have not lose a internet connection at the modem in a few day ... finger still cross . so far , it seem like a sound product . great price refurbish and I keep the old Ambit one -lrb- which they charge we $ 70 for 3 year ago -rrb- just in case . I give it 4 star because it would have be a great 5 star if it support docsy 3.0 too .