Quickly wanted to really underline what an amazing plugin this is. The first version being a tad underwhelming but still impressive, and now this second version which really took me by storm. There's still work to be done, surely, but this is still darn impressive for what it is atm. Just wanted to clarify that in the midst of all the current problems people seem to talk about. I'm waiting for animation support, but that doesn't stop me from praising both the concept and technical side of things here, and the execution.
Now with that said...
Use case would be a 3d modeling editor, where you can create a model from scratch, save it, etc. This is something I have been interested in making- using C2 to do it would set it higher on my priority list..
I've been developing something using Q3D for a couple of days now, and I've used it before 2.0 came out. Now, what I used to get things going among the modelling part of development/testing was with Wings 3D: . It's both simple and easy to use, and feels really comfortable when it comes to mocking up or making low-poly models. Not saying that it couldn't handle hi-poly, I just don't think that's why it exists per se. Took me a while to find this program and am willing to share it to others here, because it's way less confusing than Blender and way less expensive than Maya (It's free!). And yeah, it exports .obj and works very well inside C2 with Q3D.
So yeah, Wings 3D. Had some problems getting into UV mapping, but after a while, it becomes quite natural. For me at least.