Mine has been naked since I got it a month after release.
It is fairly scratched but not enough to notice in regular light.
In fact I never would have noticed if I didnt completely check out my phone one day when I was extremely bored (i legit checked it out for a good hour, srs)
I think I might buy a case or something for the next iPhone though, I get scared when I use it while walking because it just 'floats' in my palms.. I mean 1 slightest random knock or trip that is unexpected, and that baby is out!