ScanGaugeII Anyone use one?

Has anyone used these ScanGauges? They look kind of cool. I know they will display mileage, RPM, speed and things like that but what else will they tell me about fuel and spark. Seems like it might be handy if something is starting to go wrong and being able to see it before it turns on the engine light.
 
i got one back in my tdi jetta days, now i use it in the mustang... once you calibrate it you can look at your gas mileage, fuel useage, fuel pressure length of trip, air intake temp, spark advance, etc.

its a nice tool if your trying to improve your driving habits to save gas (which i dont do enough)

ive used it a few times to clear up cels in my friends cars b/c they left their gas caps off.
 
got mine installed. So far, so good. Will try to upload pics

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that didn't work. Trying out the skydrive thing

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green?
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or blue
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