Thats the gamble with a tint shop. Sometimes the guys look less than reputable.. LOL. You can always ask to see their work, or even watch them for a bit.

And it does take a while to turn out a good product. In my prime, it would take about 3 hours or so to do an X5, or something similar.

As far as the security film though, Im not sure what you would have to get to make a window "unbreakable". It seems like it would have to be super thick compared to regular film.