I agree, no surgeon is perfect! However, you want to minimise your likelihood of a disappointing result. Sliding genioplasty is a purely cosmetic procedure and you want a doc who knows aesthetics, and who will thoroughly asses your facial structure before deciding exactly how best to modify the width and length of the mandible. My concern with Dr Johnson is his eye for aesthetics, sure he'll advance you, but how far? Will he create a step-off, a deep mento-labial fold, will it create an imbalance with another feature? I would want to know that the surgeon has spent a couple of hours taking measurements and thinking through how the changes made will impact the whole face... it's not just about making a chin bigger, but creating a more harmonious and attractive face! Like I said, he probably is the best in the UK, but you'll almost certainly receive a higher level of service from a top doc in the US (such as A & G). Can you share pictures with us and let us know your surgical plan, that way members can give you there opinion and it may help! I don't mean to discourage you, and I really do hope you get the result you're looking for. Keep us all posted!