Rhino is the latest Software I added to my repertoire of CAD programs. I purchased it bundle with RhinoCam. Rhino absolutely amazing. My first Rhino project was to create a 3D model of a stainless steel spiral staircase from an Architects 2d drawing. I could not believe how fast I was about to draw a quick rough to send to the client. Ironically, the subjective benefit of Rhino is that it helped me get a deeper understanding of AutoCAD. The VRay plugin for Rhino made the stainless steel in the spiral staircase look awesome.
The Rhino, RhinoCam, and Rhino VRay are without a doubt a software triumvirate.