I haven't dared to update my iPad3 yet. How are the speeds on it with beta 5 and 6, has anyone tried? I'd like to update, but not if it's significantly slower than 6.1.3...
I just have beta 5 on my old iPhone4 and it's getting a bit faster every beta release. I will update to beta 6 tonight.
Beta 4 was VERY slow on the iPad 3- but b5 really fixed this. Beware that several apps aren't working at all though - Washington Post and EBay are the first two that come to mind. It's definitely better to wait for the GM and all the updated iOS7 app updates, unless you're working on an app yourself.