I ran this for over a month and find about a 1c difference between my old loop. Overclocking of my e6600 remained the same so I would say it works just fine. The test will be when I get my second 8800 and plan to use it on that loop. Since it has a 120.3 radiator I would say it will do a pretty good job of cooling. I have already seen loops with six blocks with this device and it maintained good operating temps.

Old loop (well now current)

DDC1 w/ Alphacool top
6mm id / 8mm compression fittings
Dtek Fuzion block

The Aquaduct was running plug n cool connectors with the same Fuzion block and 6mm id / 8mm tubing. All I can say is it clearly is the sexiest peice of external hardware available today.