Installed this earlier today, only thing thats worrying me so far is that it seems to wake up my phone (to the point it asks for the passcode) every now and then. Not really a fan of that happening all the time as I can see it draining the battery pretty quick. From what I remember reading through the GammaThingy source code it has something to do with needing to wake up the display to change the gamma (https://github.com/thomasfinch/GammaThingy/blob/2b504461c4f1...) but it seems to be doing quite a lot more even once the max temperature has been reached...

Edit: also probably worth mentioning, unlike GammaThingy the implementation of f.lux is hidden inside of a compiled nib.