I've done it, and I'm still trying to sell the head. I replaced it with an older Beseler Dichro head because I didn't like the complicated way it worked.
Mind you it's an additive process and as such you can do your calculations similar to split filter work. You can also get some very max contrast out of it too. Just remember to turn the red component down to its minimum. Even then I see it running red flashes during an exposure. Let me know any specific questions and I'll try to help.