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I've found that my buttons became more responsive all around when I started using LauncherPro. Perhaps it's just a lag issue present in the TouchWiz software? Or are you using a different launcher already?
EDIT: The back button is definitely not as good as the other three, though... Could be since we use it more?
I'd hate to return this for the iphone. Really hope there is some simple SW fix for it, but I need to decide in next couple of weeks before the end of the 30day.