A glass screen protector can not be compared to a normal screen protector. Where a normal screen protector is made of a plastic slab, a glass screen protector is a hardened piece of glass. As a result, the forces exerted on your mobile, for example by a trap, are captured by the screen protector. This will not burst the screen of your mobile, but the glass screen protector. Then you can simply subtract the glass screen protector from your screen to set up a new one. The advantage of this is that you do not have to put a new screen on your phone if you drop it, just a new glass screen protector protector is sufficient. Simple, fast and cheap.