Coming from a 7 plus, then an 8 plus, the X is truly the most amazing Apple product I've purchased since the first iPhone. The real high points (vs the 7 plus) for me have been the screen (both overall quality and immersion level due to bezels, and the size relative to the body), the gestures, the build, FaceID, and the cameras.
Compared to 8 plus I love how much smaller it is, the gestures, FaceID, the better telephoto camera, the portrait mode on selfies.
I do wish it was a little wider, but I don't think I'll switch back to the plus size next year as the screen is JUST large enough to contain 90% of the plus size data in a much smaller physical form factor. And Face ID could improve it's angles a bit, and when you wake up, but otherwise is SUPER fast (cognitively) and convenient especially when using apps that support it. It unlocks things before you can process in your mind you need to unlock.
My true measure of a device is after some time if I still am amazed by it in some way. That it really adds to my quality of life. The iPhone X definitely feels that way a month & a week later for me ... and it will only get better as software improves and adapts.
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I don't know for sure. Some say it's the use of PWM in their OLED. I'm not technical enough to understand that stuff.
PWM (flickering) is indeed pretty severe on iPhone X OLED at low brightness compared to the LCD. I can deal with it, but I notice it. Some will get a headache.