I have purchase this modem to replace a old Motorola Surfboard 5101u that give I unreliable connection . installation be easy ; all it take be a 10 minute call to Comcast and it be up and run . the speed be great ; I have the Performance package through Comcast and be able to get consistent 20-25 mbp download and 3-6 mbp upload speed . so far I have not notice any problem with this modem and have have strong reliable connection .