I have found that its brilliant to use anywhere!
Also the fan on my laptop tends to get really hot, and also the block on my powerlead, and it seems to prevent the heat from my skin.
It is really useful that the powerlead tucks inside too.
I would really recommend it to anyone, as it is also really comfy to have on your lap whilst using your laptop.
Although I have to agree with other people, it does have a funny smell to it for a while, I got it for my birthday a few days ago, and the smell is now starting to go, its the only downside to it!