Decent enough article. I think your choice to represent the air cooling department was particularly weak. You should have also used the air cooler in a typical air cooling environment -- if you would've used extra fans in the case, then put them in just to note that with air you could achieve such and such temperatures, but also do it with the same case configuration as the water cooled. Water cooling only really benefits from the additional air flow if it keeps ambient temperature down. And it should be lower by exactly that amount.
It's an interesting idea, just a waterblock with a small pump connected to a 120mm radiator. Very self contained. I don't think it qualifies as true water cooling, it's only cooling the CPU whereas more elaborate setups cool the northbridge and GPU as well. It also doesn't have any reservoir, which always lowers temperatures by making the water pass through the waterblock fewer times in a minute. Also, as pointed out, water cooling is supposed to have a large radiator outside the case, or atleast a large one using a few 5.25" bays. The advantage of outside the case is lower ambient temperatures, in addition to the obvious large radiator = more thermal dissipation. You can run 2 or 3 fans on the radiator instead of the 1 in this product.
Basically, this reviewed item is somewhat interesting, definetly a viable solution for more "off-the shelf" computers being so compact that the end user couldn't truly mess it up. For the price, air cooling makes much more sense. If instead of paying $10 for your HSF, you spent $60, you'd notice that the advantage this has over air cooling with a good heatsink is almost 0. For example, I'm running a C2D at 1.4V, but have it at 2.93GHz. If I'm not mistaken, watts is directly proportional to frequency, and squarely proportional to voltage. So, at the same voltage, the increase in frequency over 2.93GHz (that is the ratio 3.68/2.93) should increase the delta T over ambient. Now, my CPU idles at 45C in TAT, and loads at 60C. That's an increase of 15C, which if I ran at 3.68GHz @ 1.4V should be an increase of 18C over ambient during load. Thus, at load and 3.68GHz, with the same ambient temperature, I should expect to load at around 63C. Maybe a little higher. It should be atleast as good as the 66C reading you found for the item at 7v. Also, since your CPU was idling lower, at 42/43C, I can safely say that is due to a lower ambient temperature. Thus, if you had run the HSF I have (Tuniq Tower), I would expect the load temperatures at 3.68GHz to be 63-(45-3) = 60C. Exactly the same as the compact water cooler reviewed at 12v.
Yes, that's just a bunch of theory. If you disagree with my calculations or the theoretical background, please test a Tuniq Tower to see where it actually does fall.
If it does do 60C, then I have shown that for $150 you can get a tiny water cooler than does exactly what a $50 HSF does. You tell me what makes sense.