I just upgraded to an iPhone 4, and got a backless Griffin Reveal Frame to give it that bumper effect -- but I also bought some anti-glare iFrogz screen protection film. I don't really like the way that makes my sweet new screen look. I hate seeing that there is a film on it. I mean, the back is made of glass too, and I don't have a film on that. Anyone use only a bumper and no screen protector? How is that going for you? Is the iPhone 4 very prone to scratches?