I have Cingular since the merger in 2001 (6 years ago!) when my Cellular One became Cingular. I like it. I've had a corporate store near my parents house that I've gone to since we got the phones. Never had a problem there, other than one guy recently that was new and didn't understand his network.
The kiosks and other authorized agents have had a generaly lower helpfulness when I've had questions or whatever. By the way, the corporate stores can do a lot more than the authorized agents can.
Right now, it is $20 a month for unlimted data, and you can connect your phone to your laptop as a modem (phone allowing) for no extra charge. With the 3G right now, 800kps down easy. With good signal people are getting better than megabit down. Unlike WiFi, that will roam from tower to tower as you drive. Internet radio in your car anyone?
The 3G network might be to Manchester by now, as of November it wasn't quite there yet. Check your coverage
here.
3G+Blackjack=
Wetzel