The Mac UX out of the box is really quite terrible. Cmd-W doesn't close the window/tab, Cmd-N doesn't create a new document and <i>New Document</i> itself is hidden somewhere in the Edit menu. There's an overzealous use of function keys. Resizing the window is very laggy on my relatively new MBP.<p>The whole thing feels like a Windows application that was dragged kicking and screaming into OS X.