I stopped using screen protectors over the last year as I began to swipe text. (No screen protector is as smooth as glass). Travel a lot and have a pristine screen. From the huge amount of articles on the subject it looks like sand is the number one enemy and justification for a screen protector. To each his own, so don't flame me unless you manufacture a screen protector.
http://www.howtogeek.com/190107/does-your-smartphone-really-need-a-screen-protector/
http://androidandme.com/2013/12/opinions/why-i-dont-use-screen-protectors-an-engineers-perspective/
http://lifehacker.com/5881290/are-screen-protectors-necessary-anymore
http://news.yahoo.com/blogs/upgrade...eally-need-a-screen-protector--232808534.html
etc etc
http://www.howtogeek.com/190107/does-your-smartphone-really-need-a-screen-protector/
http://androidandme.com/2013/12/opinions/why-i-dont-use-screen-protectors-an-engineers-perspective/
http://lifehacker.com/5881290/are-screen-protectors-necessary-anymore
http://news.yahoo.com/blogs/upgrade...eally-need-a-screen-protector--232808534.html
etc etc