Is OS Sierra stable?
Is the Sierra upgrade a stable product?
iMac (21.5-inch, Late 2012), OS X Yosemite (10.10.2)
I haven't had any issues with it in the several months I've been running it on a 2011 Mac Mini.
No crashing reports or any major issues with it have surfaced in the few months its been available, to my knowledge.
As usual your mileage may vary with these things.
