I am happy with Redshift, as with everyone else finding f.lux on Linux buggy. F.lux is missing the boat on a lot of developers I'm guessing :)
Mac people don't work nights anyway, when Starbucks is closed, so I don't see the point..
f.lux kinda works on linux. I.e. when I start it my screen turns yellow, and that's about it. I can switch between colors by testing the 3 options with the test button (sometimes this works). But other than that its not really usable.
Now Redshift.. I didn't even notice it was turned on now, toggled it off and my eyes started bleeding.
Still have to set my location and setup a config file, but happy so far. In any case way better than a broken GUI that F.lux offers. Anyway, nothing to take away from f.lux as they've come up with the original idea.
Way way better than wearing those yellow tinted glasses that make you see blue all over after a good session.