MoI is a great product. Its easy to learn, and has replaced Rhino for me. I think what sets it apart from the rest is its simplicity -- even though it is a technical masterpiece -- and its user forums. Its community is responsive and seemingly devoted to this product's success. The developer of MoI is very thoughtful in his changes and improvements to MoI. I think he has a clear vision of what he can do with expanding and adapting MoI while maintaining what made it great to begin with.