My experience is that many of my friends who claim they have "no scratches" actually do have very subtle scratches that are only noticeable when you look at the glass carefully with a light reflecting at an angle. These scratches are most likely in the oleophobic coating and not in the glass itself, but they can't be repaired.
This happened to my iPad 2 last year after a friend played Fruit Ninja with long fingernails. Long arc-shaped scratches that were only noticeable when I held it up against a halogen light at a certain angle.
It's up to you whether scratches like this are important enough to warrant a screen protector (which probably does subtly affect image quality). It may or may not affect the resale value as well.
In other words, I don't believe most people who claim no scratches, but I also don't believe there is a "correct" answer to this question about the need for screen protectors.
This happened to my iPad 2 last year after a friend played Fruit Ninja with long fingernails. Long arc-shaped scratches that were only noticeable when I held it up against a halogen light at a certain angle.
It's up to you whether scratches like this are important enough to warrant a screen protector (which probably does subtly affect image quality). It may or may not affect the resale value as well.
In other words, I don't believe most people who claim no scratches, but I also don't believe there is a "correct" answer to this question about the need for screen protectors.