The software reportedly survives a complete iPhone restore, but who's to say that Apple won't release a super nasty "bug fix" (at the behest of AT&T) that re-locks the iPhone again? Does this make any potential ISF customers nervous?
While iPhone owners already married to AT&T in the U.S. are probably saying "so what" our friends locked into T-Mobile contracts and people in every other country are undoubtedly lining up to get the goods.