Good Lord No!
I was just about to go to bed, but this actually made me stop and post something.
My experience with them was ok until a point. Then, they double-billed me, and invented a 100-minute phone call that I supposedly made in the middle of the day. (Interestingly, the person who I called was ALSO on Cingular and the charge didn't show up on his account.)
Anyway, after dealing with their support staff (in what was truly the worst customer service experience of my life--yelling at your customer over the phone doesn't win you any points) [EDIT: I delt with four people in two different call centers; all were uniformly curt and rude], I finally got through to someone in their management system--after he spent 2 minutes on the phone with me, he proptly avoided my calls, and had his secretary tell me he wasn't in. -- At this point, the billing errors were (mostly) fixed--I just wanted them to know what a bad operation was being run in customer service. From all indications, they couldn't care less.
Anyway, Cingular is absolutely horrific. I hate them. HATE them. T-Mobile is much, much nicer to deal with--both in their stores and on the phone. (They helped me through a rough transition between a single-and-family talk plan, and gave me two free months of service because of their computer glitch) Ask their reps if they can do something to match the price/throw in a free phone, something--if you ever have to deal with customer support, you'll be pleasantly surprised.
Please don't go with Cingular. If you do, Lord help you if you ever have a problem.... [Another EDIT: I'm in Atlanta as well--as if you couldn't tell by the name.] Good luck.