I decided to test this on an older laptop, a Compaq v2000, as this is a laptop that runs hotter then the newer laptops we have here. Initially, it looked like it wasn't working at all. However, this turned out to be a problem with the laptop. After reapplying the thermal grease and retesting, the temperature drop is 4C° from 56C° to 52C°, so the big fan does cool the laptop down some.
Overall, I would buy the NC-09 laptop cooler, and lifting the laptop up under an angle always makes using the laptop more comfortable.