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I've been using a DR800S (8.1" screen) for some meths revision over the last 2 months. I found that the better screen resolution on the DR800 make it quite easy to read the math equations(ebook quality dependent) so long as you have good eye sight.
I'm using RC3 on my irex which is not brillant on the battery life but does have the scribbing functions on pdf and notepad for just notes. The screen resolution allows for a fine pen line on the screen which can be seen on zoom of the pdf but not on resize font(reflow).
I have read around 2 to 3 math ebooks on my current device and will be using it for my course material this year so far I've been happy with it.
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