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I still do not see how a black&white device is going to make it in the education market.
If we are talking about being able to read classics, a 6" (I would prefer 7") device is perfectly fine. Taking handwritten notes and so on (in "post-it") can be done on such a device.
Replacing notebooks would require something larger (9"-ish at least) but already exists. Of course, A4 size would be great, but not necessary and as such would be hard to sell (for a higher price). Handwritting recognition so far isn't good enough (in my opinion) to allow for notes to be taken and then converted to text. Perhaps in English, but French support is dreadful (accents mess up the recognition).
Now, what would be great is a device on which you can read textbooks, which I believe is what a device this size should achieve. That requires color. Most textbooks have colour in the text, the background, graphs, charts, pictures... Unless you only use very outdated books, you need color display.
Even in companies you would need a color display to make it really attractive...
And for retail even more. What would I want to read on a device this size (which, despite the low weight, won't be very practical standing in the subway)? News papers (color images and charts), comics (color too) and books with two pages displayed at once, like a real book. This device would only be useful for the latest (music sheets also, but most people don't care about that) and since you don't really *need* two pages at once, most people aren't going to want to pay a lot for this...
So as long as we are talking black&white, I don't really see how this device is going to make it, unless it comes cheaper than the existing 9" devices.
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