How well does Burglargard hold up at the edge of the window? Sure, I can imagine it would slow down even a burglar who knows it's there, but a few hits at the edge of the window seems like it would let the burglar peel the glass (held together by the film) away from the frame?
It is definitely a possibility that your glass will pop out of the frame depending on the type of window and frame. There are a lot of other security window laminates other than burglargard. 3M makes a "safety and security film" that is the same thing and they offer a few different frame reinforcement options. One option commonly used is a silicone caulk that adheres the film to the frame to prevent the glass from being forced out in one piece.
