As so many, I became a proud iPhone 4 user back in March. I really enjoy this smartphone instead of a normal phone. There's so much more you can do, and the device works well.
Then iOS5 was released on the 12th of October. As I couldn't wait to get my hands on it, to see all those new features, I installed it that evening. I was lucky not to encounter any problem during the upgrade process. The OS was upgraded and everything got recovered without a single error. So far, so good.