After using iOS 5 for two days now. I am happy. I love the notification tab and iMessenger. At first, the installation process was very frustrating. It took all night, and two OS restores. At first I really wasn’t sure how to use iMessenger, but after time playing around with it I figured out you just “text” someone with iOS 5. Also its faster and apps work better too. I haven’t noticed any difference in battery life although. If your on the verge of updating, I think you should!