Usually I never use screen protectors and the only reason I'm even considering getting one is because I bought the i6 on the AT&T Next plan and to be able to exchange the phone the screen can't be cracked or shattered. I've owned a Lumia 920 on contract for 2 years with no SP and it's gotten dropped maybe 3 or 4 times since I got it (on it's screen and on pavement/concrete), and the screen is still in pristine condition. While I've heard that glass SPs like ZAGG Glass come with shatter protection, I've also heard stories of people with glass protectors on that dropped their phones, causing not only the protector to be shattered but also the phone screen, making the protector more or less useless.