I have to think the range is worse, but super marginally so. No way I'm bothering to figure that one out. Kind a like how many licks it takes to get to the center of a tootsie pop - the world may never know.
My polypropylene spoiler has held up great since installing - and while I'd rather have a nice real CF one, I do feel a lot better about it every time I park near a curb\/curb stop or pull into my garage - I'm not paranoid about it all like I would be with painted.