Summary: I bought three of these. Out of the three, only one runs without making a bad fan noise, and it still sometimes makes a noise. I usually buy CoolerMaster laptop coolers, and those have never disappointed me. The Thermaltake Massive23 coolers made a gosh awful noise right out of the box.
Pros: Fairly silent when working properly, large surface holds up to Dell XPS M1710
Summary: It does its job, but not well. I should have read more on this unit before buying. The Fan blows air TO the bottom of the laptop, instead of sucking air from it. The fan speed is too low to make any real difference. I wouldn't buy it again.
Summary: Very slick design and all no prob with that. But dang that big fan that look so cool is not stabilized enough and makes an annoying click sound. Have to put high volume music to camouflage the sound if I want a minimum concentration.