Not to discourage the vendor who supplied the FREE TOOL offered, but its misuse could be dangerous. It basically does all the thinking for you, and what will inevitably happen is it will be given to under qualified service techs in place of formal training. (I can think of three A/C Company owners right off that would have no problem sending a filter-changer out with one of these to save $10 an hour over a trained mechanic.)
From my read of this tool, it doesn't do anymore than my father taught me how to do with a standard set of gauges, a thermocouple, and a pocket full of Sporlan Quick Reference cards. All it is doing is enabling less trained personnel to go out and make dangerous decisions. The trick has ALWAYS been to get the field personnel to not short-cut and take the time to get ALL of the system's operating readings.
My first service manager used to always say "Don't call me until you have your FLA, your running A, your high and low P's, your air on's and off's of both coils, your superheat and your subcooling T's." He didn't get called a lot as the technicians usually realized the problem while taking ALL of the readings.
Just my humble opinion