Average battery life (as in same as iOS 5) and average to better performance. Performance is in no way worse than iOS 5.
same here, i like the GM versionpretty much same battery life and performance. but new features
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If I install GM, can I go back to 5.1.1 if I'm unhappy with the GM?
I can't select the 5.1.1 IPSW file and restore to that?
Yes you can. Apple is still signing 5.1.1 because its the latest PUBLIC build.
When iOS 6 drops on the 19th, Apple will stop signing 5.1.1 and you'll be left with only iOS 6 to restore to.
Pretty sure I saw a note on the developer site that says once you install iOS 6 GM you cannot go back to iOS 5.
The beta notes also say you can't go back. However, DFU plus shift+restore and you're back on 5.1.1.
I've done it on every beta and the GM simply restores when you press restore.
Been there, done it, worn the t-shirt, got it dirty, washed it, and worn it again.
Overall better than the last beta. P.s battery life much better on new iPad.