It has other niceties, like set everything greyscale or red (darkroom mode), exclude some monitors and other stuff. For me it is a must-have.

Together with Autohotkey and StrokeIt. StrokeIt lets me navigate back and forth with left/right mouse gesture (right mouse button), close tab/window (depending on application category) by gesturing up, minimize by gesturing down. I couldn't live without it.

In Windows it won't do sunrise/sunset times if you don't enable location access. F.lux doesn't need location access, you set it manually.