I am currently wearing braces, and OSS has been a great group of blokes, especially the Drs Dellinger. Their assistants are wonderful and have great personalities. Best of all they are knowledgable and attentive.
One day, my extender broke and one sharp corner was digging into my palate. I called them on a Saturday and sure enough, they were able to remove the broken part and fix it on short notice.
BTW: If you have a kid, there are nifty video games (of the G-rated variety) in the waiting room. Periodically, they give out tickets to local Wizards (Komets in the winter season) games.