I can pick up the RG signal in a 50 foot radius, where it sits in my basement with no lag. We usually have three computers online, two are wifi, two iPhones, an android phone also wifi, and the PS3 and no problems with any lag at any time. Most of this hype is overstated by those who either do not have the service, or believed all of the FUD, and keep repeating what others have stated, with an addition of their opinion on top of it.
I knew going into UVerse that it would/could be a crap shoot, but gave it a try and knew that it was better than what Comcast was ever going to give out in our area. I will say this, that if you float a bill past the past due, you will not get shut off with ATT, unlike the greedy companies like Comcast, Charter, etc. that want the money the day it is due, and if they do not get it, they shut you down.
I still run Uverse Realtime every now and then on our desktop, which I access through TeamViewer and I will say this, no problems in system speed doing that. I only run UVRealtime when I want to just see what a channel is doing, but then it stays shut down pretty much 99% of the time. I used to run it all of the time in the background for the first year, on my Netbook, but now since I know that it is a stable service and it is giving me my money's worth, I know that UVerse is here to stay.
We have heavily saturated the connection at times with 3 HD channels on at the same time, recording a HD channel, and having my son playing multi-player or streaming Netflix on his PS3, and I downloading a .ISO on our desktop, watching a video on my netbook, stayed solid connection wise, and no decrease of speed at all as some make it out to be, that you kill the connection doing that much at once. I have gotten our 24meg connection down to 7meg, but only for maybe a min. burst period, then back up to around 18meg