DangerDen kit review by Nexus Hardware.
Note the addition of a baffle in the DD res. (there is also an unusual/exceptional Hydor 20 pump leak).
Results? 5 deg C lower than an SLK-800 (using the ole' mobo test...), but it shows that under high heatloads, the DD kit fares much better than the HSF (6 to 10 deg C).