Fidgiting is the New Concentration

http://www.nytimes.com/2009/02/25/us/25desks.html?_r=1&em

The article by Susan Saulny is justifying the experiment that lets young students do what they want as they study in class, hoping to help their concentration. Fidgiting, standing up, tapping, and other knacks are all differnet types of ways someone can concentrate. What I'm worried about, however, are the other students being distracted by their movements.
There are students with ADD and it's helpful for them to move around and fidget all they want, but there might be other students that get distracted by the movement and makes it difficult for them to stay on task.
"Children at the Marine Elementary School and additional schools nearby, are using a type of adjustable-height school desk, allowing pupils to stand while they work" (Saulny). This could aslo distrupt other students learning because of the different heights of the desks spread out through the room. It could be difficult for students, who might like to sit and learn, so see the board or hear the teacher if someone else is obstructing their vision.
I didn't really like this article because it only showed the reader the positives and left out anything negative, no matter how rational it is. It's just pushing the idea of the "stand-up desks" and not delivering all of the baggage that comes with it; there's not a lot of information is given.