I purchased this after receiving my Macbook 13". I read the online reviews and thought I would give it a try. For me it works well with my needs. First, it surely keeps my lap cooler, though I am not really sure about the actual laptop temp. It is ergonomic, being pretty non-intrusive and not having to adapt to an extremely odd wrist/hand angle. My laptop never slips, even when I angle my legs! It is very light and travels extremely well and does not use up your battery. I also have one with fans, the Vantech or Vanguard, which of course does lower the temp, but sucks up the battery, plus seems to be very fragile, and my laptop slips off of it often. I would recommend this item to others, though I would hope the price of this extremely simple unit would go down, but at around $17, I would pay that again.
My rating for the product is a 5 star, but it losses one star from me for the cost being higher than what I believe it should be, considering manufacturing and material cost. I would imagine the cost would go down eventually.