MBA 2013 Uneven Backlite on Bottom of Screen

I have my MBA 2013 for one and a half weeks now. So this week is the last that I can return it for a new one. Is anyone else experiencing a shadow about three millimeters (0.12 inches) wide and all across the bottom of the MBA? It is most apparent when opening a white powerpoint in full screen. I had the 2012er before and it had the same Issue, just much worse. The backlighting was much more uneven and reached much farther into the screen. Even with a wallpaper it was visible. I returned it and waited for the new one.

I am asking, since I want to make sure this isn't a general issue and that I won't receive a model that is even worse. What is your experience? Other than the shadow, I really like the Air.