The # are interesting. Many missed the concept (see this picture: https://pbs.twimg.com/media/AoXOpgsCAAALBN9.jpg) I have IWB in action in Sp. Ed. implementations but are truely powerful when the students take over control of them. The other part is that they are great for students who have motor skill challenges. My 2 cents.
Eli's book and ongoing work relates directly to the problem Sheila shared Saturday morning. He goes beyond the annoyance of being tracked to larger ramifications for freedom and economic well being.