I have an HTC Desire Z for 18 months. I don't use a screen protector. I normally have it in my holster when I'm out. Otherwise, it is on a table beside me at home. I have had one incident where I failed to secure my phone properly in my car mount. It fell screen first onto the gear shift knob of my car. After that incident and 18 months of use, it has not a scratch on the screen.