Shame
I was thinking of it for use on light helicopters that don't have heated screens or wipers, just a flimsy screen - hence I suppose the argument for helmets and visors.
Anyway, the way it works, is the screen is meticulously cleaned, sprayed with water, the film applied and any air bubbles scrupulously removed. It's a virtually invisible. From what I've seen on cars, the latest materials won't lift, won't discolour, and can be removed.
I would have thought less contentious than blade tapes fitted to critical parts, but maybe a bit more contentious than the vinyl stickers applied to many helicopters. Guess it would be for a manufacturer to get approval - if it's worth their while.