Just popping in because I was looking around everywhere for people who also had a similar issue. The back of my Nexus 7 was the same way only the pictures you guys posted were mild compared to mine. I'd say more than 75% of the rear of my device was like that. It would wipe away with a semi-vigorous rub via a cloth or your shirt or something but rubbing it with your fingers or simply holding it would make it reappear. It reminded me of how you can rub a suede couch or something in a certain direction to get the color/grain out of it. It was almost the same thing, but any liquid (like finger oil or a little bit of moisture) would cause it to reappear. It was really annoying on mine (like I said, it was practically the entire backing) and was frustrating considering fingerprints showed up much more clearly in those portions, ruining the material feel of the back and killing the look. I ended up returning it. I was going in to exchange it, but they had no 32GB models so I just brought it back and I'm going to try and scope out another model. If I can grab one that has only a small defect in it like the others posted, I won't worry about it. I was just popping in to clarify that my N7 had the same issue and that it was way worse than what was listed here and shown in the pictures. Otherwise, it's an excellent device, so much so that I really considered making due with the cosmetic issue on the back.