I spent several hours researching cooling pads for my 11" Air and 17.4" Pro laptops. My top priorities were that the hot air blows sideways or backwards (not down into my lap) and that the fans were QUIET. I also wanted stops to keep the feet from sliding forward, and an undersurface I could use comfortably on my lap. I settled on this Belkin for the small machine and am pleased with the purchase - it carries away the heat, is nice and quiet, and it's lightweight and smaller for travel. However, when I tried it with my larger Pro, it wasn't up to the task. If you have a larger machine that gets particularly hot, go for the Targus Lap Chill with its dual fans.