I'd like to join in this posting -
I had BSSO and Le Fort surgery with Kaiser Oakland 1.5 years ago, then requested a sliding genioplasty 6-months later, thinking it would help my slightly recessed, long chin. The surgery actually made my chin appear longer from the frontal view and did nothing for the vertical length. I am also consulting with Dechamps Braly in a few months --- I've been trying to find a skilled maxillofacial surgeon who will take on my genioplasty reversal/revision, but having little luck. The surgeons I've talked to have all said they won't do piece work (genioplasty alone), but would only consider me for full revision.
I'm fairly happy with the functional outcomes of my DJS, just not the aesthetics. I guess you can't post $$$ on this board, but if the total revision would end up </= $30k, I might consider it worth it. In my searching it seems like genio alone can be $10-20k.