I definitely LOVE the new interface. Very Lion-like. The Notebook list now takes less focus with the change of colors. In general it runs absolutely stable on my MacBook 5,1 (having it run almost the whole day) without any major hiccups. I also like the new Favorites bar (though it's referenced as "Search explanation bar" in View menu). The only thing I'm missing here is the possibility to drag Notebooks there (similar as in the new Apple Mail). This would allow me to hide the full Notebook list and still have the most important ones right up there. Keep up the great work!