I have always used Martin Fields, but unfortunately they don't make a invisible shield for the latest 4G nano. Can anyone recommend me something similar that covers both sides, not just the screen but the whole nano? I don't want to use the Invisible Shield brand as I don't like the puckered look of them. I prefer a completely clear and smooth shield. I don't want to use a case. I know the Apple Store carries those crystal clear skins, but I have heard they don't stay on well. Has anyone here used BodyGuardz?