I switched from 4S to S3 last week and I'm cursing myself. The biggest (big being the operative word) mistake ever.
The apps are crap, the gamings crap, the music players crap, accessories are crap, the os is crap, it's way too big, it's so thin and cheap feeling, I hat the damned thing.
I only got it on Friday, so if anyone out there wants to swap a brand new sim free white Galaxy S3 with warranty and my original receipt for a brand new sim free white iPhone 4s then please speak up.
I got a micro sd card in preparation for the Galaxy, but amazingly it doesn't support apps. So you can't add apps to your sd card. Then a prior feature was wallpaper scrolling, but now it's a simple static wallpaper.
If I can't get a straight swap, I'm holding out for iPhone 5. No matter what, I'm getting rid and will never leave iOS for android again or the build quality of Apple for the shambolic Samsung.