To keep your iPhone in pristine condition? Or do you go case-less and use Zagg shields? Or do you go even deeper and just use the phone naked and not care about the hairline scratches?
I don't use screen protectors, I think they are a waste of money... I just use an incase snap case. I used the slider till the snap came out. I've had the phone since launch day and I don't have any scratches...
I leave it naked at home because I love it as is, but I am too much of a klutz so I toss it in a case when I head out. Already lost one iPhone to a parking lot.
maybe I take better care of my belongings than you do?