well, mine is 32 GB (no LTE) manufactured at 10/2013 and when I hold it in portrait mode (camera on top) it got 0,5 cm bar from top and 0,5cm bar from right side of the screen with some issues - the touch is not accurate , it shakes a little bit when I hold it (checekd with couple of multi-touch test apps). Additionally at some point/area below the center of the screen (portrait mode) I get sometimes "double press" issues. I`ve sent it to repair to asus and now waiting - they`ve just updated my status to "waiting for spare parts" ...
I couldn`t live with knowing that my brand-new nexus 7 is with any flaw .