The Orzly Tempered Glass Screen Protector. I used 3 of them on my 1+1 and they did their job perfectly, not a scratch on the screen even when I sometimes thought it was done for. So after ordering my 1+3 i first bought the tempered glass screen protector from Oneplus. Huge mistake. Hands down the worst screen protector i used so far. So almost immediately i ordered myself a trusted Orzly screen protector.
Installation:
Installation of the screen protector was quick and easy. I guess the procedure is about the same for every screen protector out there but still.. The only problem is that even i wiped the screen clean with the cloth etc. But still i managed to get a spec of dust on the screen which really annoys me. I guess i'll just buy another one ;)
Conclusion:
Great screen protector, does the job perfectly. I hope i don't need to replace it any time soon.
Pictures:
As you can see on the picture below, the screen protector from Oneplus isn't all that good...

However the Orzly one:

