Intentional errors are introduced in the demo version that cause the latitude and longitude values to be inaccurate by up to about a kilometer. Otherwise, the demo is fully functional.
The effects of these intentional errors can be profound with some parts of the program. For example, tracklogs, when plotted in Google Maps or Google Earth, will appear as random scribbling instead of the smooth lines that the registered version produces.
You can purchase RoboGEO online and it only takes a few minutes. Registered users receive free lifetime upgrades.