a) I did update to the GM and know that it didn't say that there was an update when it got released to the public.
b) iPhone breaks at midnight on oct, 1st. Sure, can be a coincidence, but I doubt it.
1) Check how long I've been registered here on macrumors. I'm not a nooblet. Been running beta's since OS X 10.3 and from the first beta available for iPhone OS. The second a new beta is released I will be on it like a fat lady on a bucket of Ben & Jerry's.
2) And as I stated GM =/= public release. iOS6.0 GM had an expire date where the public release, ofcourse, didn't. I also assumed then that the GM would be identical to the public release due to the fact my GM said that there are no updates and the identical build number on the GM and the public release.
I'm in the military and was on a manouevre during the time and awake all night, the iPhone was working fine and at 1-2ish am during the night it was showing the iTunes logo with the cable, out of the blue. And it wasn't beta 3 nor 4.
But again, feel free to do as you please. Doubt me, question me. I know that when I have the GM installed, I will manually install the public released beta to make sure I don't have the same b$ like with iOS 6.