After eight years of using Macs exclusively for desktop and laptop use, I still can't get used to the counterintuitive focus management. I'm scrolling up and down in an app, start using the keyboard, and the keystrokes go to a different app! Arg! It just does not compute for me that I can be interacting with app A, move my mouse to app B, start interacting with app B, see my interactions have effect in app B, then start typing and find that my keystrokes are going to app A.