The screen is AMAZING. Best I've ever seen on a cell phone. So far the camera is above my expectations as well, haven't tried any low light pictures though, so I can't comment on that aspect. I haven't put much on here yet, but I have watched some YouTube HQ movies and was REALLY impressed with the quality. I haven't had a big problem with it overheating, it does get hot around the battery door (obviously) but nothing intolerable, at least on mine. I still can't believe how they got so much in here and kept it so thin, and also agree with the poster above, thing seems pretty sturdy but it's also the first phone I felt compelled to buy insurance on.
As far as cons, the only real problem I have with the phone at this point is the design that is inherent in all Galaxy S phones, with the power button on the side and the charging port on the top. But that's nothing I didn't know before buying it, and the screen alone makes up for that!