Ok. I for one have tried all the programs listed and a few that are not listed by my mentor Phil C. But for me the only one that I could really understand is Amapi. Phil took the time to teach me the ends and out of truespace, I just did not get it. Then I moved to rhino, Serge was way cool to help me understand how the program works but I still could not get things to look the way I wanted. Then I met Dolly and he turned me on to Amapi. I did not get the way they things work. But then he told me about the latest vershion of the program and I fully understood how to do some of the stuff that I want to do. So I guess what I am saying is all programs do not work for all people. Ron I am like this, if a program gives me to much trouble in the working of it then it hits the trash. If not for the forum here at render then I would never have met any of the great teachers that I have had. My advice to you is to look in the forums and go through them and read all you can about who is doing what with what program. Then try them all and find one that works for you.