The beta has been extremely stable on my 2010 iMac. The only thing giving me issues is the App Store, which seems to be acting like it was hit in the head with a baseball bat. I could do the Epson printer update & the Evernote app update, but the iTunes 12.5 & macOS Recovery Update just sit spinning saying "Calculating".
Also, previously installed apps are there but show under the Purchased tab an "Install" status. If you click Install the app quickly reinstalls and shows as Installed, but exit and relaunch App Store and the app in question goes back to an Install status. But the apps are there and work.
I've deleted the C & T hidden folder areas, all App Store folders, but no dice. Also of note that at least for me the ShowDebugMenu option you can run in Terminal does not reveal the App Store Debug menu anymore.
Also, previously installed apps are there but show under the Purchased tab an "Install" status. If you click Install the app quickly reinstalls and shows as Installed, but exit and relaunch App Store and the app in question goes back to an Install status. But the apps are there and work.
I've deleted the C & T hidden folder areas, all App Store folders, but no dice. Also of note that at least for me the ShowDebugMenu option you can run in Terminal does not reveal the App Store Debug menu anymore.