We switched from Time Warner to U-Verse in September 2007, and have enjoyed additional service at a lower cost. We initially opted for the TV and Internet U-Verse packages, and added U-Verse Voice a couple of months ago, with absolutely no problems in voice quality or access - also a lower price than we were paying for AT&T's unlimited long distance landline phone service.
Other than one major outage of several hours in October 2007 that resulted from an unsuccessful major software upgrade by AT&T to their TV network, we've had no outages or marginal reception.
Because we were one of the earlier adopters of U-Verse, we enjoy having all 3 TV sets with U-Verse set top boxes (STB) - new subscribers get the first STB free (a digital video recorder) with each additional STB (non-DVR) costing $5 a month. [Note: U-Verse requires a STB for each TV connected to U-Verse]. With the recent roll-out of the Total Home DVR capability, we can watch any program recorded on the DVR from any of the 3 TVs.
As one of the other posters indicated, if you opt for U-Verse Voice, you'll need to ensure it works with your house alarm system. We use ADT Alarm Services, and U-Verse Voice works just fine with it. U-Verse Voice also comes with a Belkan Uninterruptable Power Supply (UPS) that allows Voice to remain active for up to a couple of hours should there be a power outage.
U-Verse also provides the Residential Gateway as part of the Internet/TV packages. If you get U-Verse Internet, the Gateway can be configured to work as a wireless router, allowing computers to access the Internet without being hard-wired into the Gateway. The Gateway is similar to Time Warner's cable modem, although it also serves as the "gateway" between the U-Verse network and each TV in your house with a U-Verse STB.
Again, we're very happy with U-Verse and have never had any sort of buyer's remorse from our switch in service providers in September 2007.