So, any reason to move from working 9.2 on rx 470s and 280xs?
No reason
No reason to upgrade!
Thaks to all for the answers. Staying on 9.2. One week solid mining without crash.
If you're stable, don't upgrade. If you're not, upgrade. 9.3 is supposed to be more stable. I had 2 problematic rigs that are more stable with 9.3 vs 9.2