Having tried both xflux for linux and redshift, I have to say xflux works much better. It has a more pleasant hue and fades much less noticeable. I'm actually writing a Gnome-applet for it (with permission of the xflux author) that should be done soon :)
This is just one datapoint of course, but I tried this last night and actually woke up at sunrise... then ruined it by going back to sleep for another hour. Looking forward to trying this out for the rest of the week.
Is anyone else using this or f.lux. I thought I'd try out f.lux. It just kicked in ~30min ago and it's hurting my eyes. Unless there's something else causing my eyes to burn. Anyone else?
http://jonls.dk/redshift/