Pros - The fan is QUIET! I had to check to make sure it was on.
It does keep my laptop noticeably cooler.
Cons - The size and fit are strange. The ends of my 13in MBP hang off of the sides. There are non-slip panels at the top and bottom but they don't really work. Not very comfortable when I have it on my lap.
This is a cheap unit, both in price and quality. Mine lasted a couple of months, then the fan started dragging, then it quit altogether. You can't find replacement 80mm x 80mm x 10mm 5-volt fans that will last in this unit, and if you find one, it costs more than the unit new. I have read tons of reviews on this unit, ALL bad. Just spend a little more money and get a quality unit. This one ain't it! They have been making this one for several years, and I have no idea why they keep making them. They aren't worth carrying home.
Cons: loud, oddly shaped, and it stopped working after a few months. Now it just heats up every time I plug it in and the fan doesn't budge. Definitely terrible quality and not worth anything.