I had an asymmetric underbite that was corrected with double jaw surgery, BSSO + three piece Lefort I. I feel super lucky - I have full feeling in my chin and lower jaw. I am still numb in the gums over my front teeth and forward part of my pallette (forward portion of the 3-piece segment) - at this point I'm pretty sure it'll be permanently numb but I'm ok with it.
Even though it's been more than a year I'm still not fully used to my new face. Sometimes I get a little picky - my midline feels like it's slightly off from the centerline of my face, and one of my second molars isn't perfectly in line with the rest of my arch. But overall I am thrilled with the results and outcome. My only regret is I wish I would've gotten off my butt and started this whole thing years sooner.
This forum and related blogs were a godsend to me when I was lurking/researching and when I was actually going through treatment and recovering from surgery.
Now I just have to remember to wear my retainer (forever) and get my teeth whitened
Good luck to everyone going through it - it's totally worth it!