I'm holding off until December to get the new one, by then the hardware kinks should be fixed as well as a new version of the IOS. For now my 3GS is running IOS4 just fine and it's actually faster then it was and battery life is about 2hr's longer.
My mother in-law got her's 2 days ago and said she hasn't had any problems as far as holding it and hanging up but she has a case for it also and also hasn't had any problems with it so far. Now this is a women who if she even thinks there's something wrong, she'll have the apple bar guys heads mounted on her wall if they don't make her happy. There's a lot of people who haven't had any issues with there's in our company and they've tried to repeat the dropped call issue with the antenna, still full bars.