"G-Tech pro"... Too good to be true?

    The "G-Tech Pro" hit markets sometime last year, anyways, i was wondering if any of you folks out there in internet world acctualy bought and used one. I wanted to know if it acctually works, (it had better for $200) it makes no sense that you can measure your horse power through your cigarette lighter with no other sensors, but i don't know with all of these new fangled computers. So, if anyone knows anything about this device, let me/ us all know.

i have used one...i dont trust them, but some people swear by them.

Took mine to the track. It said 12.7x when I went 12.854. Pretty good I'd say. MPH is off though!