I'm not sure how many of you experience this issue, but I definitely run in to it now and again especially when using the XDA app coincidentally. On certain grey tones at low brightness and in night mode, you can get situations where you know that the screen should be a uniform gray but it just isn't. I get some areas of the screen that are definitely darker than others. It's not noticeable usually during the day or even most of the time at night, but it bothers me that it exists at all. This was a much bigger problem on some of the initial units and is much less of a problem now. It really makes minimal functional issues but this doesn't seem to be a problem with other amoleds. A bit disconcerting quirk of my favorite smartphone.