I upgraded from a 500 to a 700. In my experience the screen contrast and apparent resolution are about the same, but the UI and speed for loading books is VASTLY better on the 700. That improved speed is a really big deal if you are not a PC user. Sony's software on the PC pre-paginates LRF files; Calibre does not (because Kovid quite understandably does not wish to reverse engineer Sony's pagination algorithm). Thus, if you use Calibre, you find yourself waiting for pagination of any book when first opened. The 700 is 4x - 5x faster for the first opening of an LRF file (according to my stop-watch on a semi-random selection of large eBooks). This is the difference between being reluctant to open a different book (due to the delay) and just doing it without thought.
Of course, your mileage may vary.
Xenophon
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