Just installed mine. Compared to the Scythe Zipang I replaced, I now get an average of 11C cooler temps across the cores under IBT!
That's even more than I'd hoped for. Really, really chuffed.
Previously I was worried about temps even though my oc was stable. Now I don't see temps being a worry for me even if I push on my vcore and clock speed.
Well chuffed with the Megahalems here.