Menus and apps are sluggish on my iphone4. Garage Band kept sticking on the loading screen. Finally got it after multiple attempts. Google and Safari apps says, 'Safari cannot open... too many redirects' whatever that means. I thought maybe because it was the first time opening them with the new OS, but going back and retrying, everything is still slower to startup than with IOS6. Going to hold off for improvements before putting it on my iphone5 and ipad. Don't really see anything yet that makes me want to rush and get it. To each his own.