One of the benefits of the eink screen over a handheld screen is also the battery life question - I like the idea that I can stare at a single page/screen for as long as I want and use no battery (and not have the device go into standby mode or turn off the backlight). Of course, it sounds like iRex isn't really living up to this potential currently, but that's one of the great promises of eink, in my mind.
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