IronWolf
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I'm not a big fan of the tablet form factor for anything other than reading books, and pure e-book readers are both cheaper and better at that (at least, for fiction; gaming books or other stuff where layout and color art matters a lot are another matter).
That's the biggest thing with the Kindle/e-book reader, from what I have read online it seems they have trouble with PDFs. Well at least the larger, multi-layered PDFs that Paizo puts out. Other than that the Kindle seems great to read fiction and e-book style formats on, but I want a device that can do both which is a notch in the pro column of the tablet device.