Finally got my first iPhone this week and I picked up a case and screen protector to go with it. I didn't put the screen protector on yet because I've never done it before and because stuff like this http://forums.macrumors.com/showthread.php?t=1442446&highlight=ishieldz makes me wary. Anyone using this screen protector? I haven't found anything around here about anyone using it. Is one really necessary? As I've mentioned this is my first iPhone so I'm not sure what the wear and tear on these things are like. Thanks!!!