[curtis73]

I've personally never owned one, but a couple of my friends have said its a remarkably fun tool. To paraphrase their words its great for comparison and hobbyist use, but as far as hardcore 1/4 mile tests they're only accurate to about a tenth.

I always wanted one just for the fun of it. Even if the "dyno" test is only good to a couple percent, it will tell me how much power I'm making within 10 hp. Good enough for my daily driver