I have one, and its definatly worth the money. I don't care what people say the thing is damn accurate. It runs 4mph fast on my car usually. I was running 13.2's on it with my ET streets and I went to the track and ripped off a 13.2 first time out.
Its definatly accurate, and is a good tuning tool.
Skyler
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-1989 Saleen Mustang #406-
TFS Heads, E-303 Cam, Edelbrock Intake, and a whole lot more.
13.2@106mph
-Shooting for 12's and a 351 slowly in the works!
Stock-94 Integra 15.48@91mph