Hi Frenchy,
It is not a NURBS app. I thought I remembered in the beta period a way to get an object imported in as a "bot", though it was already a meshed poly object, but I may be wrong. The obj exporter is cool and has some cool topology methods.

Groboto works with quadric surfaces and doesnt do any meshing until the export. So thats why it can do booleans better than a poly app. The quadric surfaces are very smoothly defined, like NURBS, but different.