That g-tech meter works pretty good. I read good reviews in several magazines.
I don't use it much because of two reasons. Number 1, I'm constantly staring at the damn thing when it's in the car and I've almost stacked it several times. Something about driving flat-out and not looking at the road
Number 2, it's harder than it seems to find a flat, straight, +1/4 mile length if road to test on. You have to stop in the middle of the street, set the meter, then drive full blast and hope no one calls the cops.

Anyways, apparently you can also set this thing sideways on your dash and measure cornering g's.
ps- I have the first model g-tech not the new and improved.