So my iPhone 6 fell out of my shirt pocket the other day and the glass cracked. About a month ago, my wife dropped her phone and practically shattered the glass. Both phones were taken to my local Apple Store. Each was repaired for $109 + tax (in a two hour window). No real complaints about any of this as my family has gone YEARS without any such problems. But with the two incidents coming back-to-back I am having a ton of people tell me that I should buy some type of screen protection--such as Z Glass--to help prevent glass breakage. Do these various clear plastic screen films actually provide protection?