I gave High Sierra a try, but would like to downgrade to Sierra for now. MacBook 12" 2017 with "i5" Kaby Lake. The problem is, the restore partition would now clean-install 10.13 beta again, and I don't want that. And it also appears the App Store version of Sierra 10.12.5 is not compatible with the latest MacBook. Now THAT was surprising. "This version of macOS 10.12.5 cannot be installed on this computer." I did try to create a USB drive from a 10.12.5 image I had, but the MacBook won't boot from it. It does work on my older 2015 MacBook. And there doesn't seem to be a 2017-compatible Sierra for MacBook available anywhere. I've got a clone of a working Sierra installation for 2015 MacBook, but that wouldn't boot this machine either. I guess I'll stick with High Sierra for a while longer then. If you can think of alternatives, I'd be curious to know. Apple Support recommended waiting until a compatible Sierra version appears to App Store, but had no inside information about the date.