CFM is supposedly investigating making them. This time they will not come apart. Normally I would say do not install one on a duratec, but if you follow their detailed instructions (something I don't believe focus central included with their pulley setup) you should be okay.
In any event, it would still be a good idea to really think about this...cause if you mess it up your engine goes bye bye.
Just so you know: If CFM makes one, I will buy it.