In Messiah you do rigs and animate fast, they have an auto rig method that is very cool and worth the ($10/40) hands down on its own.
Djeust: Try importing and exporting from Blender, it should work. I exported
from another 3d software and successfully imported the obj in Messiah demo.
Also did you disabled symmetry in Sculptris before exporting to obj ?
@Mr.T as a 3ds max user.
“Note: messiah:animate and messiah:studio work with 3D Studio Max 4.2 and higher.”
There is a plug for easy exchange. Haven’t tested yet.
Look for “using messiah with 3rd party apps”
They say, they have solutions for Maya, Cinema 4D, and 3ds max to work with messiah scenes…have to be tested 
Its over we won!!