Skins for laptops

I don't know if this is a good idea or not, but I have been thinking about getting some skins for my macbook pro.

I haven't used them before, but I do think they look pretty awesome.

Have some of you guys tried them, and are they easy to get off again?

Oh and where do you find them

I've been looking at these sites 

Gelaskins

Macstyle

Skinit