I'm wearing mine since it's release day in and out and except of a few scratches (don't know how i got them) on the left there is nothing to complain about. I don't think it's necessary to put a shield on it. Here's a picture of it:
I have one on mine, bought in eBay and very happy! I have two little scratches on the shield, but not worried at all because it's on the shield and not the glass 😊
Yo can buy a cheap pack of two for 3€ 😉
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