I don't get it with all the scratching concerns. I've had the old Macbook Pros, the new macbook pros, the macbook airs, and just about every laptop Apple makes, and have never had a scratch on the inside or outside of my unit. Sometimes I wonder what people do to their laptops that they get so beat up. Sometimes when I see them sitting in coffee shops and they have scratches and dents and knicks in the aluminum I wonder how they treat their things that it happens.
I guess I just slide mine into the sleeve when done with it, and have respect for my property, so these things don't happen. Every computer I've used then sold when upgrading people always say "wow this looks brand new" ... but then again my car is 2 years old and looks brand new. I guess different people were just brought up to treat things different.