FWIW, I have worked with them. The most impressive place to see it was at a high-end learning center I worked at for over four years. We always had several students who were diagnosed with ADHD or ADD and the parents weren't buying it. The kids did just fine in a structured, positive learning environment in which they did not have distractions and could go through at their own pace.
Why do you assume that everyone who disagrees with you has no knowledge? I've also seen students who've become suicides when put on that crap. Haven't you?