I bought the IQShield Tempered Glass protector: Amazon Link

I've also heard good things about the Skinomi glass one too, the IQShield and Skinomi have the same, more accurate, cutout (it doesn't mess with the front facing camera or any sensors).

I went with the IQShield just because the Skinomi one was backordered when I was looking to buy. No regrets, it's fantastic.