I have Uverse, too, but I just added a dual band TC. My video chats were all blocky, so I figured I'd try an n router to see if the constraint was in home and sure enough, now my video chats are clear over the same internet connection.
Funny thing, though, I have the Uverse box inside a cabinet and had no range issues in my home, but when I put the TC in there, I could not get wireless 6 feet away. Moved the TC on top of the cabinet and now have better coverage throughout the house than the Uverse box.