Five stars! It's small (considering what it does), it's light, it actually looks pretty cool and, most importantly, it works! It really does keep your laptop sooo much cooler and if you have a laptop that overheats and starts to perform less efficiently, then you need this! It's not even that noisy, I promise!
A great product by Belkin and for a great price from play.com. Get one! By the way, I'm using it right now with the Belkin Cush Top that I just bought and they work together fine - it raises the laptop even more obviously, but fine nonetheless!