From the videos of the PL device that I watched, it looks like they use a double-tap on the screen to turn the page. That would drive me completely insane. In the age of gesture-based touch interfaces, using a method that is from the dawn of computer GUIs makes almost no sense.
Of course, if they're targeting business users and executives, they're all probably going to be double-tapping the screen anyways, since that's all most of them know....
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