Most reviews of the Taisol 742 have put it on par with anything in its price range when it is equiped with a fan equal to the task. The stock fan is OK if you are not going to overclock. If you are, I would recommend upgrading to a YS tech26cfm, adda 28cfm, delta 30cfm or something similar.
It fits with no problem on a KT7a raid. I have a 742 with a delta 30cfm fan cooling my thunderbird on a KT7a raid. It's a 1.2ghz running at 140x10. If I run benchmarks,rc5 or prime95, my cpu reads 43 to 45c. At idle, around 28c.
I have an adda that I'm going to try soon. But I have to say that I'm pretty happy with the delta. The noise level isn't bad at all.