well.. i wiped my iphone screen off CLEAN before i put it on, and now you cant tell if its there. i tried scratching it with my keys ( LOL ) and touching it with my oily hand, and simply wipe it off with the cloth that the iphone came with, and it was clean again. no marks what so ever.
i also saw the video of invisible shieldz or w/e it is.... and it looks like tape on the screen, doesnt look attractive to me at all, so i got this static clinger at the apple store, cheaper, and better.