Looks a bit funny
Off is On and On is Off - I saw that Build Automatically was Off so I switched it On, and then my code changes had no effect... few minutes later I realized that if something is turned Off in the UI, it may mean that it is actually turned On! e.g.Mark Occurrences, Build Automatically. Or in the case of 'Edit > Smart Insert Mode' I cannot even toggle it.
Layout and minimized Views - I like the overall layout and the fact that I can put views in the editor area. I also like the way when minimized views are selected they open in a pop-up sort of a way. Overall the UI/layout feels nice.
Custom Key Bindings - mmh...
Order of menu and toolbar items - The ordering of items in menus and toolbars can be a bit different from 3.x versions. e.g. navigate menu, run/debug toolbar