It's part of Pixologic's fiendish plan to rope up more potential ZBrush buyers, I think... "Hey, if Sculptris can do THIS...think of what I can do if I get ZBrush!"
I'm still experimenting with it when I get the chance...I've found that it can be used to make morphs for Poser figures (as long as you don't turn on 'symmetry', 'cause THEN it messes up the point count/order).
Very promising so far, I would suggest you give the hair a little more volume though, not like making them big and wavy but making them a little "fuller", and maybe you could change the texture of her tie ties don't look like that they're usually made of silk so the texture doesn't match, she looks very pretty and her shirt lookv very good, don't forget her vocaloid badge! It looks very good! Still wishing this could be for MMD ;n; But yeah so far so good, you are a really great modeler!