My iPad's still on 3.2(I held back from 4.2 because changing the lock button to a mute button would have driven me nuts- slightly silly, but there you go), and I've been wanting to update to 4.3 since it came out, but I haven't done so because I've heard rumors that it really screwed up battery life. Can anyone tell me whether the update ruins battery life? Or if the rumors I've heard are exaggerated?