I found a list of the added features available from the "Professional" version of the software (an additonal $25 on their website):
Quote:
Enhanced graphing
Overlap multiple parameters
Add unlimited graphs
Zooming, panning and cursors
Data Mapping
View the value of one parameter based on two independent parameters
Full diagnostic report
Emissions readiness
Trouble code readout with descriptions
Service $05 results - Oxygen sensors
Service $06 results - On-board monitoring
Service $09 results - In-performance tracking counters
Vehicle manager
Store and recall data from multiple vehicles
Software sensor calibration
Offset or scale any vehicle parameter (calibration in TouchScan/OBDwiz only)
Compensate for oversized tires (calibration in TouchScan/OBDwiz only)
User-defined parameters
Create your own PID's as a combination of vehicle PID's
Display Boost pressure
Display Air-to-Fuel Ratio
Support for Service $08
Evaporative system leak test
Diesel particulate filter regeneration
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Looking through the list, I don't think there's anything there that I need too badly--at least not until I kick the tires on the basic version.