A:Answer I replaced my Xfinity modem a month ago with the MT7711 and am so glad I did. It functions like the old one and I get 3 to 4 times faster download speeds. Plus, I don't get billed monthly for rental. After I powered the new one up and connected all the cables, I called Xfinity help and was connected to a technician who talked me through all of the neccesary steps to get it working in my house. The set up took abut 40 minutes. I have same phone service, WiFi, internet connection through the Comcast cable, and my home network. I say go for it.