I really like the Zagg invisible shield. Some people whine about the orange peel effect, but you cant even feel it. Sure, it adds some minor friction but only if you are pressing down hard, which you shouldnt be doing anyways. The phone can register light touches.
I think it works better than other protectors when it comes to scratch protection because its thicker and actually prevents scratches,where your average thin film of plastic just keeps dust away
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