Summary: I have tried several different coolers, but I am very picky about noise levels. I had returned a few other, more expensive, models but the massive cooling fan on this one really gets the job done at a low RPM. Keeps everything cold without sounding like a harrier jet taking off. Great product.
Summary: Since this is Thermaltake, I expected the highest in quality. I did notice plugging it directly into the computer, the fan ran. However plugging it into a designated USB Hub for USB Power, the fan speed increased dramatically. I have a completely rebuilt XPS M1730 that weighs in at 11 pounds. So this massive cooler is made for such a beast.
Summary: I purchased this because I have a Sony Vaio laptop that gets extremely hot very quickly. This unit with it's 230mm fan runs extremely quiet and I have not had a heat related issue since I started using this. I recommend them very highly to my customers for their laptops as well.