| I personally find them to be very accurate, so far my 2+2 has run a 15.0 w/ 7.1 0-60. Thats probably pretty accurate given the conditions run in and the condition of the car. My TT has run 13.5 w/ 5.6 0-60 while in safety boost. Again, about what I'd expect of the car. Braking also seems accurate, both the 2+2 and the TT are doing 60-0 stops of roughly 125ft. I could probably get lower numbers if I started braking at only 65MPH, but we've done all our testing by doing a quartermile run, then dynamiting the brakes once through the traps. This means braking from ~95mph in the 2+2 and ~110mph in the TT, hence the slightly longer stopping distances.
As always a Gtech is no replacement for actual timing gear or a tape measure, but for car to car comparisons it is great, and it also gives you some fairly accurate real world numbers to judge the overall state of your car by. ie: I know neither of my Z's are in too bad of shape as the numbers they put out are all within acceptable tolerances.
Here's a picture of the gtech PASS program you can use to later analyze your runs:
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18:21:40 06/22/04
Yes, I have the cheap one, roomate has the comp - 
