TrueSpace, nothing much I have read about their reviews, some said it is good. But I do scan their features and find that they have add many new features likr facial Expression, Flash export ouptput, and improve in many areas. I saw their NURBS modeling is great with many creative tools and maybe some more interesting tools. It price very competitively against Carrara Studio. However it is a matter of preference as long as we feel happy with with out modeling. Ed