here's how i look at it: the 3G/3GS case design, because of the rounded back, was more feminine/girly. this new i4 case is a lot more masculine with the steel band and flat back. it looks more professional. so for those who find themselves missing the rounded back, just think of it like that. would you rather have a girly 3GS or a professional manly i4?
Hmm. I don't feel that way at all. I feel just the opposite actually. The slimness is more of a feminine thing.