pediatrics.aappublications.org/content/early/2014/09/02/peds.2013-2958
A study has found that young adults who transitioned in childhood through puberty suppression and cross sex hormones are thriving. Here's an excerpt:
"After gender reassignment, in young adulthood, the GD was alleviated and psychological functioning had steadily improved. Well-being was similar to or better than same-age young adults from the general population. Improvements in psychological functioning were positively correlated with postsurgical subjective well-being."
It's a small study, but of course, when the results are so unambiguous, they become statistically significant even with smaller studies. You can of course counter this study with more science - just find a larger study that shows the opposite.