It's a very good fan. In the reviews I read it performed close to if not better than the GlobalWins and Alphas (no flames please).
Two drawbacks:
1. It is a bit on the louder side. It's the fan itself, but the air coming out of those twisted fins, give it a slight whistling sound.
2. The Original Golden Orb, which had the twist type clip, needed a hereculean effort to fix. The Socket A version doesn't have this horrible clip. But if you're using the KT7, you will have to file it a bit, to make it fit.
I'm still using the orbs to overclock Celeron 366's to 550. So, I guess it should work for the Duron too.