Are you referring to the Smile program? I too researched the Callier center (among other things) and spoke to the directors of the program a few times. I've heard nothing but raves and I liked what they had to offer. When I called, there was a waiting list for the summer so he started therapy at Our Children's House at Baylor here in Coppell in March. My ds' ST interned at the Callier Center and worked on the Smile prgram so she also gave me information. I like the approach they use (Hannon) and that OCH also uses this.
I have to say that I've been very very impressed with OCH and the therapists there. I think they're a bit more aggressive compared to other programs and they involve the parents. They are also very very experienced and work with a broad range of children. When I first started researching speech delays, it was really hard. There's a lot of scary/bad information out there that you have to weed through.
We opted not to go through the Smile program this summer when we got the call. The only reason we did this was because mmy ds has improved so significantly that it really wasn't necessary any more. Also, I didn't want to take the spot if someone else needed it more. I don't think you could go wrong sending your child to their program. If you have any questions, feel free to contact me.