How is the experience in practice? What works, what doesn't? Are updates prompt and regular?

Overall, everything works pretty well for me (user for multiple years), except all apps which are too bound too Google Play Services as microG is not stubbing/implementing all APIs.

So all apps with premium subscription you can only handle through in-app purchase, usually won't work.

I've heard that some banking apps are not working correctly either as not "secured" enough device, in my personal experience, they all worked, it's really a case-by-case logics here.

For the upgrade, OTA upgrade around every month, and it has always worked smoothly