I just started using Tolanalyst and thought it was one of the best features nobody uses kind of thing. It has the potential of making a huge difference when it comes to tolerancing parts efficiently and effectively. Unfortunately, it seems half deployed. Can't delete a previous study, graphics are showing up right, redimensioning dimensioned items, moving dimensions in drawings/models to the appropriate plane, etc.
If this were to get more attention and be more complete, easy to use, and robust, I think it has the potential of revolutionizing the machine design community.