I would love to hear more MacBook Air users' thoughts on this too.
My wife has a current (2012) 13" Air and the screen hinges have definitely become looser over time, to the point where if you adjust the position of the Air on your lap, the screen moves downwards a little.
By contrast, my 13" MacBook Pro has a much firmer screen hinge action that has not loosened up over time.
I'm looking at replacing mine with an Air next time around, bit this bother me a bit. Have most other users of the 13" Air had the same experience?
Cheers,
Mike