Am loving this new AUC8 update.
Everything is running smoothly and whilst it is too early for me to comment on battery life as I give it 2 or 3 charge/discharge cycles before posting, I can say that it will be no worse than the previous AUBB update.
No lags. No overheating. The new baseband/modem is an improvement on signal strength by about -6 or -8 dBm.
Like the camera improvements and particularly the portrait mode to take pictures using the main camera.
All I did after receiving the update was the usual steps to wipe the phone's cache partition in Recovery and used the Galaxy App Booster in Galaxy Labs to boost app performance.