something to keep in mind too is that SW does not do all things well. there were many a time that i had to delete faces and use surface lofts/sweeps, etc to hand what looked like simple fillets.

I can, however, understand the frustration at the "...PARASOLID..." elites and I had to swear many a time at them.

Side note - in the past I also had to use a local Rhino guy to add fillets for me on models in which history was not important (SW being a history/feature based model for those that do not know this already).

I have wondered how simple the concepts are on fillets when looking at them from the mathematical perspective.