I have been wondering ( more or less ) the same thing myself... though just from the perspective of an absolute beginner in Vue who's "test driving" the Vue 3.1 Limited Edition for the first time. It has an interesting rudimentary modeling system that allows creation of decent structures... but if I'm to get on in this app... well, I need more. Namely OBJ file export so that I might polish those structures in my other 3D apps ( mainly trueSpace ). Yes... I do try to do things as cheaply ( still just learning, after all... took me a couple of days to figure out how and which "Limited Edition" apps would allow me to get Xfrog into trueSpace and Vue ) as possible. But I still like to take advantage of the individual strengths of each one of them... and that means they absolutely must ( somehow ) be able to export/import to and/or from each other.