Robert missed what I think is the biggest drawback of many of the Brand-models of
Book readers: Ergonomics.
Hold a PEz in you Left hand: The advance page is near your thumb, uncluttered by other buttons that can be inadvertently pressed.
Hold a PEz in your Right hand: The thumb wheel is near your Index finger, with NO other buttons nearby.
You can hold the PEz naturaly as you would reading and not have to move your grip to change pages.