I carry the same philosophy into my professional work as a CAD detailer. So I need another tool. Several projects have come my way recently that included things like spiral garage ramps. Granted, these can be approximated using surface patches and such, but my clients need a more accurate picture with extractable data points along any edge or on any surface at any location. That's where Rhino has been a tremendous asset in my toolbox.
Rhino comes on CD like just about everything else nowadays.
The manual shows attention to detail. Several well-illustrated tutorials with prepared material on the CD will help just about anyone get up to speed quickly. Just stick the CD into the drive, interact with a few dialogs and you're done. This allows upgrading directly from the McNeel server. The default Rhino editor layout contains four viewports configured as the top, front and right side views, and a perspective view.