Personally with GG4 I am not using a screen protector. It's almost on par with sapphire now. I did not use one on my M7, or my M8's. I had one tiny scratch on one of my M8's from sand when I was down in Belize, besides that my screen is still perfect. My M7 had quite a few little scratches on it. I am confident my M9 will be even better with the newest revision of GG.