Noticed A LOT of dust getting under the digitizer glass (seemingly from the volume buttons), so I brought it to an apple store to get checked out. After the guy basically said "we don't have that model in stock", I had to inquire about a replacement without the box. He found one for me and exchanged it for the dusty one. When I got out to my car to inspect it, I was shocked to find several noticeable pieces of dust under the glass. So I went back into the store and the "expert" sales guy inspects my replacement with a flashlight and confirms that there are in fact particles of some sort in there. At this point another guy gets called out of the back to "take care of it". The 2nd replacement was perfect and it seems to be holding up. I wonder if this is a known problem with early shipments, or maybe the fault of one of the display manufacturers.