It sounds like we're coming from the same place.
My specialism is developing CAD systems in the broader sense, CAD being any design software which best enables the designer to convey their ideas.
I have been looking for something that will represent good quality realistic vegetation to use in conjunction with Civil 3D, 3Ds Max, Revit, etc... and this seems like it would do the job well, and at a good job.
Tying these programs together with Terragen will be the interesting bit, especially in a dynamic, fluid professional environment.
I will keep in touch.