I just wanted to read as cheaply as possible (library, project gutenberg, google pub domain) so this was the perfect device. I'll be waiting for the game changer - color e-ink. Anything else coming w/o that feature is just the same stuff with more fluff.
the 5" screen increases the perception of pixel density, don't miss the 6"
i love the back material of the reader (the 505 all metal wasn't too great in cold climates)
i would change the mickey mouse appearance of the button. not too fond of using my thumbs to flip the page in the middle. should have brought back the dedicated page turn buttons on the side!