I have used Wings 3D mostly and Amapi 6.1 some. Tried Truespace but didn't like the interface. I bought Carrara 5 and Hexagon 1.2 last month and just got Hexagon 2 installed yesteday so I will probably be using Hexagon more and more. The good thing about Hexagon was several of the features are similar to Amapi and since I have already been using Amapi it should help my learning curve for Hexagon.