With my last phone, the GS3, I used a film screen protector for a couple of months, then went without one for the next year and a half. The screen ended up with a couple of very minor marks, none which could be felt or seen with the screen on. Since my iPhone 6 is still only two months old, I'm back to a film screen protector for now. I'm not crazy about how it feels or collects grease, but I feel better knowing that if I want to upgrade to a 6S, I'll have an absolute mint condition 6 to sell.