There are some unresolved issues, but it is stable for me (no soft reboots). I use it as daily driver.
Some prominent issues are broken manual network selection, wifi speed problems on the 2.4 Ghz band (culprit: Google's NearbyMessagingService), badly implemented transitions between performance profiles, and problems with remote desktop connections (RealVNC) .
Does anybody know a workaround for broken manual network selection ?