mine get some scratch one time i put it with the screen down over some dusty surface.
Gorilla glass is resistant to metal scratch, like with keys in you pocket, coins, etc. But with sand (that use to have some percentage of quartz), gorilla glass get scratched easily.
I have my O2X since December, and been a little carefully, i didn't get other scratch.
Never put screen down.
Keep your pockets clean of sand.
Sorry for my english.