In most demanding games, my GPU will consistently soar to 90-93 degrees Celsius. I didn't like seeing temps in the 90s so I figured I would pick up this Cooler Master for a shade over $20. Is it worth it? I think it is.My Sager NP8130 is 15.6" and this cooler fits it just about perfectly - I have maybe 1" of extra room. My laptop's rubber stops on the bottom keep it anchored pretty well, and the fan itself isn't super loud. There is an adjustable dial to change fan speed, but when I'm gaming, I generally just have it on max, and when I'm not gaming, I turn the cooling pad off altogether.The one thing I would make sure you do is use the little legs on the bottom of the cooling pad to prop it up an extra half inch or so. It makes a world of difference in how much more air can flow through under the pad and up to your laptop. Also, beware of using this on top of a table cloth - it seems to impede air flow as well. With the legs propping up the cooling pad, my GPU temps only hit about 84-86 degrees, but without it propped up, my GPU is still 90-91 degrees.Overall, it's a small ~$20 investment to potentially increase the life of my laptop as a whole. 

Question: How does the fan work?
Answer: this cooler fits it just about perfectly