I got my iPhone 4 today, replacing an iPhone 3G of two years... after my initial shock and wonder at the device (its amazing screen, its density and perceived heft), I was blown away by how fast and responsive it was. I could do anything I wanted on it, quickly. That feeling normalized quickly. Then I felt a weird sense of familiarity. This used to be my iPhone 3G! I could surf or read Facebook or check emails or news quickly and easily with it, long before the glacial slowdown it's experienced since June. I'm happy to have this smooth mobile experience again, but I'm slightly annoyed that this purchase was motivated partially by the crippling of my last device by iOS 4. Anyone have a similar experience?