I remember reading an article on it taking place in Broward County. It seems something that only the wealthy can afford.
They really need to do a study with children from different social classes. If they are only using it for children of upper social classes, then it's likely the results will be skewed. They should get poorer children and also pick a variety to try it for. A fair study in order for research at least.
Also it would be interesting to know the starting points of the children prior to going in, and how much improvement when they came out.
Also are they doing brain scans at all while doing this?
It's interesting as i know lack of oxygen can be devastating on the brain, so i am curious about it.