Great waterblock, but isn't the best DangerDen block for quad cores. That said, it's still cools the CPU far better than anything else on the market outside of DD. Kept my Q9550 @ 3.8Gigz (2.8 stock) @ around 45c idle, 60c under full load max heat generation over a period of about an hour (using Prime95). Which is impressive.
The mounting kit is a bit of a pain, but understandably so.