I just received mine. This thing is HUGE and barely fits into my Antec 1030SX.
At any rate, it's not hard to install, and the performance is BRILLIANT. On my 754 3200+, I can set the fan to 60% through the BIOS, and even at 5% overclock (2.1 instead of 2.0), the max temp under Prime95 stress is 52C.
The stock 754 cooler was 54C on idle and 64C under stress, and it was much louder than this Freezer 64.
Temps are much lower when I run the fan at 100%, but of course it's louder as well. I prefer quiet.
If you have a Socket 754 and a stock heatsink, you owe yourself this cooler, it's outstanding. The heatpiped AMD 939 stock coolers are already pretty nice, so I think the benefit there may just be that this one is quieter.