Can't say my Tri-X experience is flawless, the cooler is fantastic really and when it works it damn works (well it works every time, no issues there)
The issue I'm having and I did not resolve it yet is that on first boot after the PC was turned off for like a couple of hours, I usually get no monitor signal for some reason. And it's not PSU or cable, since I used HD6990 before and it sure as hell needs better PSU and used the same cable and had no issues EVER.
Of course it is more of an annoyance, but I am a bit concerned that it may be a harbinger of the more serious things to come.
So, I'd go for Gygabyte, even despite the fact that Sapphire cooler is AMAZING, really insanely cool temps for air cooler, never seen anything like it...