I'd rather wait for the released stuff in December. Once you opt out of the beta your device gets wiped. It also has a bunch of fixes one of them I think being the garbled sound on video recording.
Ah I wasnt aware of the device wiping, but I guess I'm ok with it for this round. Don't think it wipes it if you opt out once the version is released so I didn't opt in until this latest beta.
Bluetooth wise if anyone is having BT problems with their cars..... this beta doesnt fix that you can't seek with your car audio controls if you are having that problem.