Ok, first of all it is so annoying to have to use a cooling mat for a laptop. This means you cannot even set the thing on your lap to use it! If your laptop keeps getting too hot then you need to get a new laptop but if that is out of the question...buy this cooling mat/fan.
I got this about a year ago to keep my old Dell Inspiron 5100 from getting too hot and damaging itself. I went to Wal-mart and it was under $30 so I got it to save money over buying a new computer. It was a good choice and has served me well. Before I got the fan, the heat actually fried my hardrive, and now it doesn't even get hot!
This thing has no skid rubber pads to hold your laptop in place and weighs about a pound. It uses two fans to pull the heat away from the computer and out a rear vent in the mat. It plugs right into your usb slot and needs no outside power source with an on/off switch. The fans pull 28 CFM (cubic feet per minute) really cooling the computer down.
This thing is lightweight, super efficient, and effective, not to mention inexspensive. This is a good buy for anyone with laptop cooling problems. GREAT BUY!