I have found that the many improvements have made me more productive. I updated three fonts (14 typestyles) yesterday as I noted in this thread. I made a short video (which is available on my review page) about the new features. Let me know if I missed anything important.
I particularly like the navigation around the font or OpenType lookups by clicking on the Preview Toolbar/Panel — that saves so much scrolling and searching.
In the latest update issued since the initial release, Erwin added a shortcut (Ctrl H) to show/hide glyph fills, and Ctrl F10 to launch MainType.