Most of the people that I know who upgraded to iOS 5 are actually satisfied with it, including myself. My iPhone 4 is working WAY faster and way snappier with far less errors than I had with the previous iOS 4 release. However, I know a few people that are having the opposite affect. Their phone constantly crashes, they lose all their info, and their phone is slow as hell. I don't know what happened to those people, but I'm sure Apple is already working on 5.1 and 5.2 to fix all the reported problems people have been having. I think sometimes we forget that this is the FIRST public release of iOS 5. It's expected to have some bugs that the developers didn't catch. You gotta be patient with stuff like that, or at least restore your phone and install iOS 5 clean on your device.