Suppose one wanted to guage their vehicle's performance w/o running to the test track... say with an accelerometer.

is this worthy?

http://www.ebay.com/itm/K-A-T-Matrix...item3ccc7c33e4

Is there any other choice? What are all y'all doing for this?

I worry that it is made by the same company that made this POS

http://www.ebay.com/itm/OLDSMOBILE-M...c14e86&vxp=mtr

which then resulted in this ad:

http://www.ebay.com/itm/Oldsmobile-M...3f4849&vxp=mtr