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> it doesn't dramatically reduce screen brightness or image quality.

AFAIK it significantly decreases the brightness. Jerry Rig Everything demonstrates this here - https://youtu.be/TRW4W7KkJXs?t=32

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significantly and dramatically are two different things. I was sceptic when buying it but have no problem using the display with privacy screen on, and dont see that much difference in brightness, even in direct sunlight, fwiw.

Bonus with it on you can stretch your battery life, only half the pixels actually active saves quite some battery, who knew!

You’re paying more for less brightness.

Only if you turn it on for the whole screen at all times, and you are still getting a privacy screen out of it so its not a loss with no benefits.

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