Well I think it can be used in realtime, at least on my system it's working quite well so far. But I think the amber/blue filtering method is even better than red/cyan. If the picture gets too dark or colours appear wrong you can postprocess your scene before the 3d-shader with a simpel colourfiltering shader, to lighten it, or change the colour quality in order to prevent the effects, created by the 3d method. It's working for me, and I myself like the results belonging quality and performance very much. Fast movements make it a bit harder to follow the 3d (for me at least , as I often focus on one of my eyes stronger than on the other one), but that's a matter of training I guess.

The amber/blue method seems to have a patent... Does anybody know whether this means restrictions in using this effect commercially? License?