For a long reading DX is better, but for quick references, ability to make an annotation fast, perform quick searches etc. iPAD is so much better, but my eyes do not allow me to read for a long time from it. So I use them both ))) There is an unofficial update to 3.2.1 for Kindle DX, which I prefer to an official firmware 2.5.8 as far as 3.2.1 gives a better PDF support and better browser.
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