Hi Greg - SpaceClaim does have a lot of useful editing stuff in it - it's called a "direct modeler" or "history free" modeler which is a kind of different system than a history based one.

Basically instead of having a list of instructions on how the model was constructed like a history based modeler, it instead analyzes just the existing geometry and decides how to extend or rebuild pieces as needed when you pull faces around.

One thing that's really good about this system is that it works on any kind of imported file.

But it's also kind of more oriented towards editing more mechanical semi-blocky-ish type stuff - not so much for modifying swoopy flowing surfaces or things of that nature.

- Michael