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at&t has pretty limited 3G coverage right now.
One thing they have going for them, however, is that HSDPA can get much faster transmission speeds than Rev 0 or Rev A. Once they've built it out enough, they'll launch it at 7.2Mbps and upgrade to HSUPA later. Sprint will have to play catch up when that time comes, as Rev A has a theoretical max of 3.1Mbps.
Also, Sprint tends to only have one or two T1 lines feeding a tower - so basically, the maximum possible speed they could provide is around 3Mbps to a SINGLE customer... the more people on the tower, the slower the speeds.
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