Dr. Li is regarded as one of the top authorities on maxillofacial surgery so I would suggest consulting with him. He is nice, helpful and very skilled. He is also a board certified plastic surgeon (he's the only maxillofaical surgeon in the world who is).
However, in regard to your question, he seems mostly concerned with making the airway as big as possible and less so with aesthetics. He has a standard approach to advance the jaw at least 12mm for sleep apnea patients, and counter clockwise rotation of the maxilla to reduce the amount of forward maxilla movement needed. He'll even do MMA's for patients without using orthodontics first.
He showed me photos of two MMA patients and I thought they looked really bad. They had that chimp look (which can result from big forward movement of the maxilla with counter clockwise rotation) and pig looking noses (widened base and big nostrils).
To give you a comparison, he suggested 12mm jaw advancement with no orthodontics, while another doctor proposed 8mm with use of orthodontics. My face definitely would not look good with 12mm advancement.
