So I have been experimenting taking Sculptris models into ZBrush. So far, I'm not liking the results. Because it's all tris, it tessellates very strangely, so when you divide up, you get all kinds of little pimple pock marks all over your mesh. Since I'm waiting to get 4R3, I'm using the 4.0 trial, so there is no Dynamesh :( That would probably do it for me! Either way, I'm really beginning to like this workflow, and I cant wait to get my hands on Dynamesh.
The Sculptris mesh in ZBrush
This is what happens when you subdivide the model up...not pretty.