I came from a 4S, I have had every iPhone since the original and several high end Android Devices Galaxy S, Galaxy S2, Galaxy Nexus, Galaxy Note I think of myself as a phone junkie. I really am enjoying the 900, I have only had it about 24 hours but so far it does everything that I need it to do. I love the keyboard on it, what a joy to type on, the screen looks fantastic although a bit pixelated. The camera is okay not great but not terrible and the OS is as smooth as butter. I am finding that I enjoy how internet explorer renders sites better than Safari and I have found apps to cover all the apps I had on the iPhone 4S ... I am happy thus far that I made the switch.