That's insane. I don't think I'd want to do it, but it's very cool still. I assume as others have said that it's never going to be as perfect as paint, but for someone who doesn't care that much, it's a good idea. Imagine just changing the color of your car every few years.
2008 BMW 335i: Jet Black, Jade Gray, Gray Poplar, 6MT - Stock... for now.