I tried this "upgrade" for a few months, but I didn't see any speed increase! I called several times but Comcast reps could never make my connection any faster than my normal service (they don't seem to know or care if I can get the increase in speed). I am lucky to get 3Mbps DL. It may increase your upload to 368K, but unless you get 7-8 Mbps speeds, it's not worth it. It doesn't make sense if they can't either 1) get you the speed as advertised or 2) provide you with the modem that's capable. I've tried several modems, and nothing got me the 8 Mbps speeds. Sometimes, I get very slow speeds which doesn't really make sense. All I can say is, go for it, but check your speeds! If you don't get it, don't pay...