Kinda hard to justify the cash at the present moment. I personally would wait until V5 is introduced before dumping that kind of cash. I've been using V5 WIP and its great! It has tabs to switch views as well as tabs for menus. Now my interface view isn't shrunk down by all of these additional menu bars. There is tons more that I'm still finding with V5. Here is a [nomedia="http://www.youtube.com/watch?v=7zpKZPOo5hg"]YouTube - Novedge Webinar Series Episode 3 What's New in Rhino 5 WIP Part 1[/nomedia] to some videos that show some of the differences. Hope I helped.