iPhone 7+ almost a year old. Absolutely pristine as I keep it in an otter box case with the built in screen protector. There really is no reason to have a phone in anything other than new condition.
iPhone 7, never used a case or screen protector. A few hairline scratches on the screen (unnoticeable when the screen is on. And a slightly scratched corner on the back. Looks pretty good for a 4 year old phone.
Xr - no case. Scratched aluminum frame. Scratches on screen only visible with phone off. Not a big deal. These are disposable devices which I usually keep for two cycles.
Not a single scratch. The finish has started to change near the back camera. Either from the million cleanings my phone has gotten or rubbing on the case. But my Otterbox keeps all my phones in fabulous condition. I drop my phone often so the Otterbox is worth it.
A few VERY small scratches on my 11 pro max screen but hardly noticeable. Not sure were those scratches came from and they can only be seen in certain angles under light. The rest of the phone is like brand new. Keep in in an otter box case.