I just got a Apple-refurbished mid-2013 13-inch Macbook Air. It's great -- except that the keyboard is noticeably noisier than my previous model from mid-2011.
Specifically, they make more of a clicky sound, not when pressed, but just when you brush your fingers across them.
It seems they are looser and make a sound when the keys move laterally within their slots and touch the metal.
Is this by design for this model?