I much prefer the Rose screen to Flux. Flux changes the colors but, sorry I lack the English to articulate this properly, the screen makes all light less "harsh". This is most visible when looking at a white background. Even with Flux on the rose tinted is much "softer" and easier to look at than the same screen without.

FWIW, a neurologist recommended the screen to counteract excessive optical stimulation from computer use.

I've stopped using Flux in favor of this screen, even at night.