May I ask what your opinion of Triaca is?
I haven't spoken with him personally. But his publications and before and after showcases are very impressive and he invented the chin wing procedure. I think he is probably the best surgeon in europe which is reflected in his pricing. That doesn't mean he can guarantee a perfect outcome but I think the element of random (bad) luck in a surgery outcome is minimal with him. Also, if you need to redo/undo a previous jaw surgery in europe, you will most likely hear his name come up.
That's not to say a lesser known surgeon can't produce good results, it's just that you pay a premium for consistent good results since you don't want to have to do this more than once.
edit:
@gregorsamsa
you are right, of course. there simply is no way of knowing what the outcome will be beforehand. the only solution is to have multiple consultations and to research the surgeons. then pick one you feel most comfortable with. if at all possible, pick one who had good results with similar cases to your own. but there will always be some risk left, you can't make a perfect decision.