My MBPr has got a few chips out of the aluminium already. But I had a MacBook Air previously for over 2 years and it never got any chips or scratches at all. I haven't used the MBPr any differently. So I was wondering that maybe the material used in the MBPr, or perhaps in all new MacBooks, is weaker or softer than previously used. When I felt the material of an older MacBook Air, it feels slightly more textured, whereas my MBPr feels smoother. Any thoughts?