We liked the schroth clinic in Wisconsin. It is something my dd has to do everyday for 1/2 hour, it helps with posture and lengthening the spine.
I would rec. the therapy to anyone. Just know it takes investment in time and buying equipment to do it at home.
We are lucky that the clinic was helpful in giving directions on how to make the bars...and my dh is handy so the equipment cost was minimal to us.
Schroth is a type of physical therapy based on Katrina Schroth technique.
Out of all the options out there, this one came with plenty of references and after talking to 5 satisfied patients I was content to go.
It is recommended to do Schroth in addition to bracing, Schroth prefers rigo cheneau brace. After consulting with an orthotist specializing in bracing he took a look at her double curves and said he could make a brace for her there are no guarantees that it will help stop the curve or correct the curve.
Because of this we decided to go with Boston, the one her Orthopedic Surgeon recommended. Teh Schroth clinic stated they could fit her, but if we had any issues we would have to fly across country to get fitted with the Orthotist...and to me that doesn't make sense. I prefer someone closer, who can fix the issues locally.
After a week of intensive PT , she was taller and back muscles looked incredible. I have a folder of pictures here, I will try to scan them.
Whatever you decide to do... research and get references, get 2nd opinions and then just make a decision you can live with. 
I haven't posted in awhile, my dad became very ill, and recently passed away so I was kinda walking in a fog. Its been one tough month for our family.
age 15
Daughter diagnosed at age 13
T20 l23 10-09
T27 L27 1/2010
T10 L 20 in brace 4/2010
T22 L25 12/2010 out of brace
T24 L25 7/2011 out of brace
Type 1 diabetes- pumping
Wearing a Boston brace and Schroth therapy
Faith, Hope, and Love- the greatest of these is Love