I installed the AT&T DSL modem on Saturday, with the end results about what I expected. The download speeds are a little slower than Comcast (15% slower) but solid. it surpised me that the upload speeds, while still much slower than the download rate, were about twice as high as with Comcast.
There were a few minor glitches, though. As you can see from the Speakeasy speed test results, below, I initially had really bad download rates:
I called customer service, and they identified the problem quickly, Within 10 minutes, I had download rates appropriate for my High-speed Elite service. I also have pretty bad static on the phone next to the computer, so they're sedning me a replacement dual line filter to keep the DSL traffic from interfering with the voice traffic on the phone lines. Overall, I was quite impresssed with their efficient service, especially since I felt they could tell I was a computer person who generally knew what he was talking about, so they didn't drag me through an endless series of basic questions.
The wireless router worked great. I connected my Wii without any problems, so now I can look up the weather and news from the Wii. I don't know yet why that's exciting, but I hooked it up just in case it is.
So in a few days I'll call to stop our Comcast internet service. I expect to save $20/month by making the switch. So unless the AT&T service becomes unreliable, it will be a very worthwhile change.