Even though I really appreciate the idea behind it, I was never all that comfortable running f.lux on my Macbook. I never understood why it was free yet closed-source. It made me suspicious in a way, if that makes sense.

After a while I just gave up and uninstalled f.lux. Instead, I created a 4500K white point copy of the default color profile and manually switched to it at night, which seemed to have the same effect. It also prevented those big flashes whenever switching to and from full-screen apps.

I'm grateful that f.lux has pushed this issue to the point of getting traction as a built-in feature from Apple (and I do hope Apple brings it to OS X at some point), however unless f.lux becomes open-source, I don't plan to reinstall it.