My first job was in a plastics plant and one thing I noticed was that when you deform clear plastic, it tends to become cloudy. I wonder how these will fight that, seeing as almost every one will be folded at some time in it's lifecycle.
Australian currency, which is made of the same polymer and has transparent windows as well, seems to handle it just fine. No matter how strongly I bend and abuse it at the window, it doesn't lose transparency.