Well for stills, rounded edges at render time works very well.

As for the polycount using voxel conversion, it's really an issue.
Maybe manageable on simple project, but if you try to apply the same process on a more complex model, you need to crank up the voxel density to a point
3Dcoat or Zbrush will hardly handle the data. This is especially true if you are picky with surface quality and you want to capture every detail from the input CAD geometry.

I have mostly tried every software around for that process, but Houdini is really the only one that can deal with this process quite smoothly.
It's possible to transfer MoI styles data during the conversion, pretty cool.