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I've played with one a couple times. It's reasonably accurate within a few 1/10ths of a second but I consider it to be more of a toy than an actual diagnostic tool.
Flat road and an understanding that the G-Tech does not measure reaction time, and slight changes in elevations throw off readings. The G-Tech may not be super accurate, but above all else [and as a tuning tool] it is consistant.
__________________ -Harry AIM: NDcissive
CRX and Pre '92 Civic, Engine Tech and Tuning, & Track and Autocross Forum Mod