I've been liquid cooling for 4+ years. This block is the highest quality I've seen yet. I had a koolance block fall apart on my board and observed condensation using the tygon tubing sold by another vendor.
Danger Den sells thicker tubing, which is just right for my setup (no more condensation). More important, this block exceeds my expectations. Also, I'm very happy w/the DD radiator AND MOST DELIGHTED BY THE EXCELLENT CUSTOMER SERVICE.
Cooling EVGA'S 8800GTX (831) & in a loop with my FX60, idle~30c to load~40c.