the problem I have with the plastic snap on type is that dust is able to get behind it, and it also scratches VERY easily. The film type don't protect it from bumps. The GGS glass is laminated, sort of like the windshield of your car, and is only 0.5mm thick. It leaves a slight gap between the glass and the actual LCD and is sealed all around with strong adhesive. It does not scratch easily at all, after 4 years it is just starting to show wear. It's so thin that you don't realize that its on there. I find it annoying when I pick up a camera with the snap on protector.