Batter life seems to be a bit better.
And if you want to potentially brick your phone, go ahead and install OS7 without a developer account! I accidentally installed it on a phone I did not have the ICCID registered on and it was a bit of a pain to fix.
PS: I did the full install, not OTA.
I have beta 2 on my phone without a developer's account. It's working great, it's not on fire, hasn't exploded, hasn't been bricked.