This message is in response to questions about the ScanGauge:

For the "trip computer", everything works:
* Maximum Speed
* Average Speed
* Maximum Coolant Temperature
* Maximum RPM
* Driving Time
* Driving Distance
* Fuel Used (Gasoline engines only)
* Trip Fuel Economy(Gasoline engines only)

For the "Digital Gauges", I think everything or almost everything works. You can display 4 at a time, so usually I display Vehicle Speed, Fuel Economy, Coolant Temp, and Fuel Rate. Here is what I recall off the top of my head but I will cycle through them the next time I get a chance:
* Fuel Economy - Works
* Fuel Rate - Works
* Battery Voltage - Will have to check
* Coolant Temperature - Works
* Intake Air Temperature - Will have to check
* Engine Speed (RPM) - Works
* Vehicle speed (miles per hour) - Works
* Manifold Pressure - Will have to check
* Engine Load - Works (at least a varying number is displayed)
* Throttle Position - Works (at least a varying number is displayed)
* Ignition Timing - Will have to check
* Open/Closed Loop - Works

I haven't used the "Scan Tool" functionality yet since the check engine light hasn't come on.

As far as downsides to the unit, the unit generally works as advertised. The biggest issue for me is that the orange button lights reflect back at me from the slanted windshield at night if I have the backlighting turned on (as detailed in my initial post). It would be nice if the unit could retain multiple days of data and had a USB port to download it to your computer (rather than having to manually copy data from the unit), though perhaps thats too much to expect at this price point. For a behind the steering wheel placment, there is an extra 12-18 inches of cord which I hid by taping it underneath my dash. And finally, as with all gizmos in cars, be sure not to have an accident by focusing on the unit too much as you drive.