As soon as you have PDF material that is made specifically for A4 (or letter) format, any 6" might be too small. Especially if the PDF doesn't have reflowing of text. I think you'll be dissapointed with any device in that regard. A collegue of mine had the same, mostly references guids and such. He ordered an Iliad (8") and a BeBook (a hanlin clone, 6"). He liked the Iliad, and found the BeBook too small. In the end, he sent them both back, as the Ilias just was too expensive.
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