We don’t know whether to believe the strength of this screen protector. Still, it’s nothing we would try without one. The video shows someone putting an almond on an iPhone 4 (or iPhone 4S) screen and crushing it with a hammer.
Now, we are sure that the video is real. We just don’t know how protective the protector is. We figure that the almond too the brunt of the force coming from the hammer. Still, there is no doubt in our mind that the protector guards against scratches, which all smartphones will have with regular use if you keep them in your pocket or purse. They aren’t horrible scratches, but they will happen.
Had the hammer hit the glass directly, we think the video would have ended very differently. Who knows.