Most of the 8.x versions have had major bugs in them. 8.2.0.2 broke Airgroup/mDNS for me, among several other things.
8.3 runs wayyyyy better than 8.2.0.2 or any 8.2.x for that matter.
There are still some bugs in 8.3, but no major bugs that I've found so far.
NTP is still finicky.
Some APs show incorrectly as up, down, or not at all still.
From an end user perspective, its the best 8.x so far.
iann