Our FIRST Jr. LEGO League team used this for their exposition. The kids built a rotating satellite dish for a moon base that was triggered by the distance sensor. It worked well and was quite popular with the kids. I showed them a couple sample programs, then one of the kids on our team was able to write the final code for it by hooking up all the logic blocks such that the motor power was controlled by the distance sensor.
It did manage to drain my laptop pretty quickly though; I went through three batteries during the couple of hours of the expo (which usually would be enough for the laptop to run all day)
It would be nice if the price could come down some and if there was a way to use other software than the WeDo with the hub. I can think of some fun things to do with it hooked up to a desktop computer (where the battery won't drain down)