This thing gets a lot of love by a bunch of folks here, so I gave it a good half year of trying. But it's just too annoying. Around 5pm, your display turns pinkish orange and it becomes a lot harder to see anything. Code gets harder to read, colors display wrong, video just fades to black. None of the advertised happiness ensues. The second half-year it remained installed, my only interaction with it was to notice it…
Tying it to sunrise/sunset is what makes it useless. In winter it starts the transition at 4 pm while I'm still working. The amount of daylight I get in winter is already low enough, using f.lux would make the winter depression even worse. I could of course trick it by settings the location to place in the Southern hemisphere, but that won't help me during spring and fall...