--I used both my 5 and my 5S naked for a year and did not pick up any scratches on the brushed part of the aluminum back. The chamfered edges were another matter, but that's not an issue on the 6 since the chamfers are gone (likely because they were scratch magnets). Since the 6 uses the same brushed texture for the aluminum as the 5, I think you will find it will hold up pretty well as long as you don't do anything crazy like put it in a pocket with keys.