Upgraded to an Aura from my old (but still working) prs-300 and honestly I'm loving it.
Of course, upgrading from such an old device it would probably feel great any device, but I can't issue a single complaint so far: light is good and even, touch screen responsive (I'd say more than my father's Glo).
I've uploaded around 200 books in the main memory via Calibre and after having read a couple of books I haven't found any bugs either
