We don't have any plans to do a full review, although it might show up in a cooling roundup at some point in the future, so I'll give you my thoughts from a short round of testing.
The fundamental problem with any passive cooling rig like the reserator is that the warmer the room it is in is, the less efficient it is at cooling your PC. So as your room gets warmer, your PC will get hotter.
You also have to make absolutely certain that you keep it out of direct sunlight, otherwise it can even heat the water in your system. I don't understand why they made it a dark color instead of silver or white.
If your room doesn't get too hot, and you can keep it out of the sun, the reserator's not bad at all. It's not a bad product, but you need to know its limitations.
Why can't there be full reviews done on these products?