Full support for three diagrams. No support for protecting changes, and no reverse engineering. One user was frustrated by the demo, although the problems they reported seem to be fixed now. The full version which I had on approval had an installation bug which was quickly fixed. Support seems to be good.
Every modification made to the diagram is saved to disk after each change.
The continual writing to disk could slow the application for a big diagram. Good on-line help, good 200 page user manual. No facility to automatically redraw the diagram if areas get too complex. I have doubts that this tool would scale well for a big application. Contains report generation.