piezoelectric effect

I've been pondering piezo speakers, and wondering what their main limitations are. How good could one be made if a lot of effort was put in to it? Why do those piezo transducers always have to be disc shaped? I see there are piezo strip actuators. Could a piezo speaker be a thin strip, like a...

This is a buzzword these days in high-end tweaks and products. It is a real effect and worth knowing about it but certainly does not justify the use of the term in our high-end world. From my favorite electronic blogger, Dave Jones: