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I've never seen anything about them on any Mustang forum (and I've read most of the back posts on the few forums I visit)... seems a bit hokey to me... GPS is accurate... but not terribly so especially with the size and power you'll be getting there and I'm guessing that's how they're getting all their information as they don't tie into your car's computer anywhere.
I'm guessing it's a gimic... spend the 200 bucks on something that'll make you go faster.
i had one and i sold it. the hp numbers werent that accurate but the 1/4 mile time was. its fun the first time u use it but then u kinda ask urself y u wasted the money on it. good thing for me i didnt by it, i got it for my b day and sold it within a month. if i were u i woodnt waste ur money, see if someones got it and use it, dont go out and by one.