Highly optimized 13x RX480 rigs, custom per card bios, etc. 0 invalid shares, 24ms accept time, on eth1.ethermine.org
Was running perfeclty stable for weeks with 11.1

Witih 11.2, 11.3 and 11.4 crashes all the time.
Hash rate increases but there is no point in it if I have to lower the memclocks to keep the cards from crashing.

Back to 11.1 and stable again, relatively high stale rate (5-15%). 0 invalid shares. 24ms accept time.
Back to 10.6 and lowered stale rate even more (2%).

For me, I'll stay with 10.6
Or can you think of any cons?