I have this and the problem is the length of the arms. In storage, they hit and rub against the insides of the lenses, scratching it and removing whatever protective coating there is, if any. Store your shades in its container with the lenses wrapped in the cleaning cloth or else you'll regret it.
UPDATE: The drop seems to show 2 different models here. The one I have is the one from the second picture (rubber pads on the inside face at the ends of the arms). I'm not sure if this drop is for the first or second picture.