I don't believe in using any screen protector
I had infact even demo infront of my friends trying to scratch Note2 display with scissors n blades dragging across display. I had even posted video of it on youtube. Display intact. Only stuffs harder than glass eg sand, diamond could scratch it.  And chances these will hit my display is zero with flipcase protection
Keys, coins common stuff in pocket will never scratch the display n probably only the phone metal sides