It's good. I found out memory wasn't 100% stable at 1500 (would crash ~ once in 2 hours of straight gaming and other weird desktop problems sometimes) so I reduced it to 1150/1400 for stability testing (will try 1450 in a week), and it's 100% so far. Waterblock is great, everything works... no issues at all as of now (knock on wood).
(for those who didn't see the thread, I have a XFX R9 290 flashed to 290X successfully)