Hi St Anna,
Things are good here, except sailing season is over. ): I will get some specific info for you on the research, but from short personal experience you can use the autopilot in the conditions I've been in. I have read that the autopilots work until real nasty weather. Has to do with the greater propensity of a cat to stick to more of a straight course, and the effect of twin rudders. Will come back to you on the research, but I don't want to make this a cat vs mono thing since I like sailing both.