I love my PRS-505 for fiction reading, and it has also served me well for PDFs. I can't say that I've never had problems with it crashing, but all in all I am extremely happy with my purchase. When I upgrade I plan on getting another Sony device (either the 650 or the 950, we'll see!). For academic reading, though, while I have been able to use my 505 for PDFs I would be better served with a 9.7 inch screen, and I would like to pick a device up for at-home academic reading (maybe the new Pocketbook 903).
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