I have a KT7 with a Taisol CGK742092 heatsink, and I think it's great. Right now, my CPU temp is 37 C. [running a moderate load] and the system temp is 23 C. Generally, on idle, the CPU temps are in the high 20's or very low 30's; with a heavy load, my temps have never gone above 44-45.
It's fairly easy to install - that's "easy" as heatsink installations go, i.e., it didn't take me 2 seconds, but I didn't sweat over it for hours.
I recommend it.