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Depends on how it's implemented, blue cut filter can work very well. I have f.lux on my jailbroken iPad and it is really nice. It does not go all the way to red/orange, just a very warm yellow. You can set it to change the temp slowly throughout the day, so you don't even notice it and it looks very natural. If you happen to turn it off at night, you may think woh that is so blue how could I stand looking at that.
I don't know about the health / sleep claims but a warmer light at night makes sense because it is just more smoothing. After all, you don't install the same white fluorescent lights you have at the office in your bedroom, right?
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