Real data: my Mac Pro transitioned from betas to production fine, albeit with some annoying warning messages about unexplained dangers during upgrade, about a Preboot folder that would be deleted, so be ware.
Hours of backing up later, it just upgraded off the beta train perfectly, though didn't explain why it took some valid files (perhaps cached from iCloud) and dumped them into a folder.
Hours of backing up later, it just upgraded off the beta train perfectly, though didn't explain why it took some valid files (perhaps cached from iCloud) and dumped them into a folder.