I can't find the link right now, but there was another review putting the Hedgehog against the Alpha, and the Alpha performed better due to it having more pins than the Hedgehog. I will post the link if I find it.
EDIT:
Hedgehog meets Alpha Review
EDIT: I am adding this from my reply to another post:
I really cannot put much faith in reviews. One comes up with different results than the others. I go by personal experience, and from testing on many T-Bird/Duron systems that I build. So far out of the FOP38, Arctic Cooler, and Alpha, the winner for me has been the Alpha. I have steered clear of the Hedgehog due to Plycon not accepting returns on them being damaged in shipping because of how soft copper is, and easy to damage or scratch. Even Kyle at HardOCP stated the fact in one of his news pages a few weeks ago warning people how installing/uninstalling the Hedgehog too much damages it.