So I am obviously an iPhone user and decided to get rid of my iPhone in anticipation of the S4. I've used the Galaxy S3 and Note 2 before. Found the S3 to be unpolished. The screen was pixelated. The OS was slow and the phone's build quality was no match for any iPhone model. It twisted creaked and the buttons felt mushy. The Note 2 felt a little better in terms of OS and speed. The buttons weren't as mushy and had good feel. But still wiggled. The body creaked when I gripped the phone. Well, the S4 build quality is quite a lot better. The buttons don't move. They click. No creaks and everything fits well. Nothing is loose which is great. The speed is very good in certain apps and it is feature packed. Battery life was very good on the first day with heavy use. Photos were okay (iPhone is better). My complaints: The OS does occasionally lag. No doubt about it. It isn't polished 100%. Camera is already scratched after 1st day. Once the novelty wears off, the Air Gestures and such don't get used at all. So overall, I think Samsung did a good job stealing away one of Apple's customers. I am keeping the S4 unless Apple can really wow me with both superior hardware and software in their next update.