Paolo wrote: "I used SolidthinkingLt and the update(Forma) a few years ago, and it crashed all the time..."

Same experience here. I once spent a few weeks thoroughly testing ST as i wanted a parametric modeler to complement Rhino. To me, it was then (and probably still is) the most similar parametric system to Rhino (and now to MoI) in the overall feeling. But stability was always an issue. Even simple history modifications would often crash it. I will give ST developers some credit as it has some really cool features such as point editing a surface and not breaking history from the input curves. But then there are other things (those things which may be done 20 times in a session) which are so much more complex to do than in MoI or Rhino.

jonah