Used my Au one a few times coming home and love it so far. However on my last return I was stuck in the line behind a couple of amateurs who slowed things down a little - one who raced ahead and tried to stick her silly face in the frame with the person ahead of her in line (trying to see how it worked I guess), and someone else who removed his glasses and then couldn't see what he was supposed to do as far as looking at the lens.