[drbawb]

I have f.lux on my [jailbroken] iPhone 4S and my desktop.

On the desktop I like it simply because it helps automatically "dim" my display in the evening. I don't use much artificial light in my room [it's basically a mancave after 5:00] so a bright display with the standard color temperature is just an exercise in eye-strain.

I can't be bothered to adjust my brightness, contrast, and temperature manually every evening to avoid eyestrain. Since my monitor doesn't have programmable presets, f.lux definitely provides a great [automatic] solution.

On my iPhone it's actually more of an issue, I find myself disabling it frequently. I think this is mostly because I use my phone in a wide range of "lighting contexts." I might walk from the man-cave to a fluorescent-lit kitchen, and then I'll go out into an incandescent living room.

In my car, I find the low color temperature kind of difficult to read, so I'll usually disable it for road journeys. (It probably doesn't help that I have a dark OS theme and my navigation application has a dark blue "night time" mode that is also time activated.)