Dr. Newman totally "gets" gifted kids. I think most of her work is with GT kids. Yes, she is pricey, but I didn't want to get DS evaluated by someone with less experience. Gifted is a special realm. She will submit to your insurance if there is a diagnosis along with gifted, such as a sensory disorder or something like that. All in all it ran us $3,000. Yes, we had 7 two hour sessions. It doesn't always take that long, but DS hit the ceiling on several subtests, so it took a long time to get through it all.
DH and I feel it was very worth it. We were to the point of ultimate frustration and we didn't know how to help DS. DS is one of those kids that fly under the radar. He wasn't causing any disruptions, wasn't rude or defiant, but he started saying things like he wished he was dead and he didn't have any friends. That's when we decided to have him tested.
Like your son, DS had motor and social issues. We called him our little old man trapped in a toddlers body. He has lots of physical and emotional sensitivities. I mentioned this to Dr. Newman and she said that the sensitivity never lessens, the child just learns how to adapt. She recommended a great book called "Mellow Out They Tell Me...If I only Could".
I wouldn't say the testing has paid for itself yet in terms of school placement, but it has helped DH and I understand him better and has opened up a new door for him. As we went through the testing DS learned a lot about himself too. We use the scores as a tool to help us advocate for DS.
It's a big decision, and the cost of testing was just the tip of the iceburg. We have him enrolled in all sorts of stuff just to keep his mind active...chess, piano, karate, robotics, spanish...not to mention books! We go through 6 novels every two weeks, I can't keep up with him

Someone on this site said to hang on because it's a crazy ride. They are absolutely right.
Jaina