GoSoapBox: A way for quiet students to speak up?

If you are wondering whether mobile devices have a place in your classroom, consider GoSoapBox:

I think most people would say that the Confusion Barometer is the most innovative feature. Students can indicate when they are confused with the click of a button, and the teacher sees a graphical representation, showing the trend in the number of confused students over time.

Is that something that would help your classroom?

Would this let students who are more reserved speak up rather than sit back and pretend that they understand?

Have you tried it?

What do you think?