The functionality of Carrara 1.1 and Carrara Studio 1.1 is the same ( there is a free upgrade from 1.01 to 1.1 ). The "Studio" part refers to a package of plugins, a copy of Amapi 5.15, and a printed manual. Amapi features NURBS modeling and exports an RDS 5 format which will import into Carrara. The 1.01 to 1.1 upgrade covers a long list of defect repairs. There is an Amapi 6.0 - which includes a vertex modeler and there is a bug fix upgrade for it in process, but it seems to be hanging fire at present. So the "Studio" offers the option of NURBS modeling while trying to get more customers for the Amapi upgrade path.