Have been mostly great for me, I use the calendar, files, and gallery apps on multiple devices pretty much daily. The difference between fossify and the ugly bloated bullshit google is pushing nowadays is stark. The only problem I have had was with calendar not sending notifications properly but I suspect that was android derping and not a problem with the app itself.
Yeah, it is extremely difficult to troubleshoot the notifications on android since the settings are so convoluted. One never knows exactly where the problem is. I hope linux phones becomes a viable alternative soon because enshitification is rapidly making mobile devices unworkable.