I have not tested, using one of those online download speed testers since my service went "over" to Uverse from DSL. I am not a power downloader, etc etc.
I will say this. ATT-Yahoo email service is very, very slow. It takes forever to load the log-in panel, and forever to retrieve messages. I have Uverse at home and DSL at work, and both are extremely slow. I can get a Facebook or BARF page up instantly but not anything to do with ATT or Yahoo, including email service, Yahoo News stories, etc. They really want you to use their Web-based browser rather than a machine based mail program, yet their web mail is much slower. Our ATT service at work stopped being compatible with Apple's native Mail program in October, and all of us had to load Thunderbird to continue machine-based mail. It does still work at home however, where I have a similar Mac etc etc. This is a known issue so its not just us. Our support dude couldn't make it work either.
They have had terrible problems of course, just this month with Yahoo mail with 18 million email passwords exposed. Our office depends on ATT to exchange news stories, photos via email. We lost service for a few days, etc etc, though its working now.
I think ATT-Uverse is just huge and a little out of control. But like I said, for regular web-surfing, its plenty fast.
As for their service, you need to call during business hours to speak to someone in-country. After about 5 PST, their help desks switch over to foreign.
Because we have a U-verse two-line installation (too far from node so it takes two lines to power our service) it took months and months to get our service right. I have had more than 24 visits in the last year and a half trying to get it right. And it finally is. I have had every kind of problem. They always will try and fix it but it gets really old. I am on my third digital TV tuner, my second backup power supply. I have heard every possible explanation of what is wrong with my service, but as I said, its finally stable.
The worst thing is, I apparently have better service than Comcast customers, which is just bizarre.
The entire Uverse premise, of fibre optics, is pretty much a lie. It only is fibre optics to a certain point. Then it goes right back to the same cabling it ever was, in my case, 40 years old phone lines in the house. I upgraded my own inhouse with some Cat 5 (or 6? cant remember) just for my Internet line, but it doesn't seem a bit faster. And when you get a good tech, he will come and do your termination of your cabling if you are handy and want to replace your wiring.
As for billing and charges (this is assuming you are going to bundle), be prepared to call every three months and scream at their Retention person because their promos expire. I call Alexandria, Lousiana and talk to a few folks and end up with a three-month discount until it expires.