[mschaef]

I have both a DX and a Paperwhite. The resolution on the DX isn't perfect, but I find that it works quite well for PDF's of academic papers. (Mostly formatted with LaTeX, with some occasional scans of older typewritten papers.)

The paperwhite, however, is terrible for papers, and I don't think the higher resolution screen would be helpful. At least for my eyes, cramming a full letter sized page into the small screen wouldn't work... so I'd still be left with a view of a subset of the page.