has anyone ever tried one of these, been looking at videos online and it seems accurate http://www.gtechpro.com/ss_fanatic.html
I bought the original Gtech maybe 12 years ago or more. It looked like a radar detector. It was a pain to use becuase it was accurate when I tested it at the track. Even the first one had the G meter, 1/4 mile time, 0-60-0 meter, and i think horsepower calculator. It was fun to mess with.
I've had both and still have the new one (G-Tech-Pro). Can't verify the accuracy, but they sure are FUN!