The S3 is about as large as I'd want to go in a phone, but since I use it as a computer and not a phone 9 times out of 10, it's definitely worth it.
I have a Galaxy S3 myself. I don’t think I’d step back to something the size of an iPhone, but it’s not even about the size, it’s the purposeful hobbling. Only Apple can get away with being a generation or two behind on technology and be touted as “cutting edge”.