Maybe I'm just being OCD, but I have noticed when scrolling through things such as this forum which is on a mostly all white background on my 6s, there are a few spots (especially in the upper left area) where the screen seems just SLIGHTLY darker than the other areas. It's mostly only noticeable when scrolling text over that spot as I notice it with the movement of that text. But if I'm on any other screen that has colors, it's not noticeable at all. And even when looking at a screen with a white background and not scrolling text, I don't even really (hardly) notice it. Is this just the way it is with LED screens like this, where the lighting may not always be 100% even? Or is this a flaw? I honestly never noticed anything like this on my old smartphone, but I don't know if I just didn't NOTICE, or if it truly had no issues.