My friend bought a Beltronics Vector FX1. It's almost identical to the g-meter. costed about $150. Works excellent. We passed it around in our group of cars, and so far, it's shown itself to be pretty useful. I gives you a 60ft., mph @10,20,30,40,etc. 1/8mi, 1/4mi, lateral G on takeoff, stopping, and cornering. Overall, very usefull. I'd recommend one.