Heres a constructive comment:
1. Clean install does not equal restoring from back up.
2. Installing the right build for your device helps.
3. If you ever, at any point, have unnaturally bad battery life after following 1 and 2.... You're lying.
I know troubleshooting, I do it for a living, and Im familiar with people lying about what they did hoping for an answer they won't otherwise get from people who pay no mind to those who don't troubleshoot on their own.
Clean install or don't post? We're talking about a GM here, it NEEDS to work even if the upgrade was not done via clean install, it's customers we're talking about.
1. I agree that a backup from a beta build is bad idea, although a backup of a public build must work. Yes, most of the times many issues are solved by clean installing the OS, but that's not an excuse for things not working right.
2. iTunes only allows the right build to install on the right device, so this bullet is useless.
3. Battery life DOES sometimes go crazy bad and believe me sometimes not even a clean install works, so no. One is not lying when asking if someone else has the same issue.
And finally, 4. don't be so rude telling people to "clean install or don't post", we're supposed to help each other in the forums, not shut the other people up