I have gotten to play with this new toy for a couple of days now. I sprung the $4.80 for the proper app. Let me tell you, this is one app I recommend paying for and not using the free version.
I can not believe the amount of data this thing reads

. It is almost too dangerous because I can't keep my eyes off my phone while driving. It works for both my cars.
The most important find so far is a verification on how hard our 3.0 (M54, I think) engine has to work to move this truck. ie. Torque registered the throttle at only 37% and took the engine load all the way to 98% while the same acceleration in the W211 only took 55% load. I watched as small hills worked the engine to about 25% higher loads than in the car. Granted it is a car vs. SAV but still these poor engines are worked too hard for the weight.
**Still have not found a car with a fault code to check that function out
True fun for all true car nuts