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How do you find Cingular's GSM coverage?

So far, so good. At least in Houston, it seems to be strictly better than T-Mobile, although when having long (> 1 hour) conversations, I've sometimes been cut off every 20 minutes or so. I don't now if this is a network congestion issue or a phone overheating issue or what. I never had that problem with T-Mobile, but I got the new phone and the new network at the same time, so it's hard to know what to blame. I've been to a few other cities since I got the phone, and coverage has been consistently good. I haven't yet taken the new phone to somewhere where Cingular is the new kid on the block, like New York, where the legacy infrastructure is owned by Verizon and T-Mobile (nee Omnipoint).

My main gripe with Cingular, at least with respect to T-Mobile, is the customer service. T-Mobile is open 24/7 whereas Cingular has normal business hours. Likewise, Cingular's bills require a CPA to truly understand. In theory, they're billing you for your next month of service and then they include corrections to your previous month of service, all on the same bill. In practice, it can be very confusing.