I've been running it since January. It's not really.
cgroup-bin breaks suspend on my computers (bug is reported and left without attention), radeon on dual-GPU notebooks has to be blacklisted, a lot of apps crash with 'ASSERT failure in : "Got an update for an invalid inteface. Investigate this.", file atspiadaptor.cpp, line 899' because of some changes in accessibility support. And so on.