This is an excellent kit. I used it all the time on customer cars and they were extremely satisfied...came out like new. The only downside is it takes quite a bit of work, but otherwise highly recommended.
It's all around improvement from boot times to game loading. It's very worth it at this price range and I'm thinking about picking on up. I currently am running 2 of the same generation 74gb in raid 0 with ssd for cache. I'm definitely contemplating this right now :D
I think he's talking about his experience. 90C for a long time has never harmed his cpu so he doesn't believe it's harmful. Two to three "personal processors"is a really bad test quantity to make that call.