I’m in the Slow Ring for Win 10 updates.
I have 2 PC’s with Win 10 and i have had minimal problems with all the updates. One problem i had was with my Radion Video Card not being recognized after an update, but that was it.
I'd consider that a major issue. Not as bad as loss of wifi on a laptop, but enough to cause me to shut down updates.
Maybe after they release Service Pack 2 it will work ok.