I know quite a lot of people who recently started using Simplify3D and there are more and more angry screams amongst them for decent written documentation. The general tone is that, if this were free software, nobody would complain... but it is not.
Myself I got to grips by patiently going through the forums with a variety of search terms. But I'll admit it was not efficient, and I still have occasional doubts about certain parameters.
Based on what I have seen in other enthusiast-centric communities I strongly believe that IF SIMPLIFY WERE TO LAUNCH A WIKI (that users could login to and edit with their USER/PASS), then very rapidly we would see the community WRITE AND MAINTAIN FULL DOCUMENTATION for all aspects of usage.
In the meantime I think I can speak for everyone to say we are delighted that the Team focus on the development and evolution of an excellent tool and product.