I just installed one of these on my Tbird 900MHz. I swear it was tuff, so the clip will hold very well to the cpu. It replaced a GlobalWin Fop32-1.
It runs a few degrees cooler, and only tops off 4 degrees higher under full load. Not bad for an "older" cooler. I guess the copper helps.
It does sound like a harrier - but not much louder then the 32-1.
I installed it like it asked, with the fan blowing up/away from the heatsink...not blowing down onto it like others. It seems to work great.