Stable, snappy and smooth are words that come to mind with this upgrade. Being a RayDream user as well as a Infini-D, I believe that Carrara 3 has finally matured in to a very comprehensive package. Just the feel of it has really improved and although the interface has changed, I think it has been enhanced for better usability. Definitely, I do recommend to upgrade. But then again, I do all my modeling in it so to me the enhancements in this area where very welcomed.