I used Rhino with Madcam when I was running my Tormach.
I have Mach 2, Rhino3, Madcam 2.0. It all worked pretty well.
My Tormach has been sitting idle for a couple of years as every spare minute has been spent either at work with 80 hour weeks or trying to bring part of a small farm I bought in 2008 back into Ag production.
I am planning on upgrading the Mach/Rhino/Madcam to current revs and get back into things in the next month or so.