I recently ordered this equipment and returned it because it only had 2 ethernet ports on the back. I have an extensive wired network in my house and my current gateway has 4 ports... all taken. I know I could hang a purchased router off one of the ports ....but would rather use the Comcast supplied one. does this new equipment still only have 2 ethernet ports? I think that is a pretty serious flaw.
The XB6 xFI Advanced Gateway only has two ports, correct, but you don't need another router, any cheapo gigabit ethernet switch will do.
This is what I was using with my XB6.
I have been using the NetGear 8-port unmanaged Gigabit switch with my Xb6 for a few weeks now and very pleased with it's performance.
You made the right purchase choice