As far as I can tell the Substance Painter to 3ds Max workflow is working very well. Just found an old model I made from a Blender tutorial slapped some smart materials on in Substance Painter, exported Albedo, Metalness, Roughness, Normal and Height maps. Just slotted them into the new material and all seems to work as expected. Took about 10 mins to do all together. Great work on the new material Corona team!