Glass screen protectors

Wasn't sure if you meant protectors for glass screens or actual screen protectors made of glass. Just looked it up. Seems interesting. I've always used the cheap static cling ones that you can get on amazon for a dollar or two. My reason for using a screen protector is to prevent micro scratches on the oleophobic coating on the phone's glass, and I always end up putting my phone in the same pocket as my keys. When the protector gets scuffed up enough from that, I just switch it out with a new one.

Seems like these $20+ fancy screen protectors would make me just as afraid of scratching the protector as I would my phone screen.

The nexus 5 has screen that is prone to cracking, I've read that the tempered glass protectors for them are the way to go. People say that the protector will break, but the actual screen itself won't.