Commando just arrived. This is my first smartphone, and I'm worried about scratching the screen. I know it has Gorilla Glass and it's supposed to be tough, but how about scratch resistance? I'm a geologist so it's exposed to field conditions. Will a screen protector make it significantly less touch sensitive? I've always used screen protectors on all my other field gear (well, not my first camera, but the screen is all scratched) What is the consensus? Thanks for your input.