The results for both my relatives were horrendous. I ended up switching one of them to other orthodontist and dealing with the consequences of very long time brace treatment for my other relative. They decided to pull out a hidden tooth by braces for three years which never had a chance to be pulled out. They neglected to give up that treatment and it ended up with a surgery to pull it out and another year of braces to bring back the teeth to the proper position. That didn't happen perfectly but caused root resorption for almost all teeth.
Finally after more than 4 years and several thousands of dollars, we are in much worse situation than before and need to spend much longer time and money to recover the problems they caused for us.