Congratulations, very original tool. Automatic generation of the UML diagrams is something that was always missing in the traditional UML tools.

If you are studying OO concepts or doing OO analysis in the real project, this tool will help you. Its big "pro" isthe possibility to really simulate class models and check them. The "con" could be a high abstraction level it operates on (without the possibility to generate code). However, I believe the time of the executable models is approaching, so the time is on this tool's side!