Implementation is really nice, actually. The display automatically switches to a white on black mode and the brightness is automatically regulated.

You can override either display setting (day/night and brightness) manually, if desired.

Given that it's an LCD, the performance is quite surprising. The blacks are very black. Just take a look at the set of controls at the bottom, is near impossible to see where the controls end and black bezel begins.

I have 0 brightness or visibility issue with the screen. It has not even been a thought that has crossed my mind.

I also regularly battle with brightness settings and night time shift on my iPhone and Watch. (Granted that is a more difficult task for Apple).