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The biggest draw for e-ink technology is increased battery life since the display, the biggest battery hog, draws power only when being "written to" whereas an LCD screen (such as JB's and JBL's reflective LCD screens) is on constantly, constantly drawing power. JB's and JBL's reflective LCD screens draw less power than most LCDs since they do not require backlighting which increases battery draw (of course, the downside of a reflective LCD is not being able to read in poor lighting). Other power drains are WiFi and 3G. People have different preferences. I like the longer battery life e-ink screens offer. They are also easier to read from. However, they need to clear the previous screen with each screen rewrite creating a "flash' many annoying to intolerable. I don't find it to be a problem. The JBL, however, had two features my previous e-ink device didn't have, one being the ability to use field-changeable nonpropietary batteries, and one of which is essential for me: flexible zoom. Most people seem to prefer longer battery life in a lighter unit so e-ink screens will continue to proliferate.
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