I gave in and enrolled yesterday too. Seems pretty stable so far, though the phone runs warm much of the time now, and the battery is draining quicker. 15 minutes of screen time browsing the web and this app = 10 percent. There's a bunch of tiny visual glitches in the transitions, animations and such, but I guess that's to be expected.
Of course I found out after the fact that dark theme, one of the big things I was looking forward to checking out, is no more, and it sounds like night mode will be going away also. Oh well, hopefully next year.
I'm anxious to see how the battery will hold up during the work week.
AC App
Nexus 6