I know a girl (she had SRS the same time I did, same place) who had vocal surgery done. She sounded great, but she also said she had to make sure to work on her voice as well, even after, with inflection and resonance and things like that. It helped with the pitch lots, she said.
She also had FFS and a BA (I think maybe body contorting, as well) too, and looked great. She had a lot done. She looks amazing. I felt a bit of jealousy, although, not because of the voice or looks (good for her), but that her parents are very supportive and have a lot of money -- 21, and SRS was last on the list. I wish I had parents to get all that for me, FFS, BA, body contorting, vocal surgery.