I havent done an entire vehicle, however we did all the front and problem areas on the race cars that we built when I was working at a porsche race team
The damage that can be seen to paint from one race is what you would see after 2 or 3 years. We would have it peeled off and replace it and it worked great.
I think it is a great idea to use on the front and around wheel wells (rock chip prone areas)....as far as doing an entire vehicle, I would be wary, its gonna be a pain in the butt to peel it off and replace it when the time comes, and really isnt going to be doing much in some places...and its not cheap either