It works better than f.lux for me, because it works at a lower level than Gamma table manipulation. I’ve been using Night Shift ever since it was released and I like its color rendering more than f.lux.

But it’s subjective, some people like the extreme warmth of f.lux more. It depends on how you perceive colors and how well you can adjust to warmer colors.

Shifty is also a very nice addition if you want more control over Night Shift: https://shifty.natethompson.io