I used the Sony 505 for about a year, and before I'll buy another eInk based ereader, both the contrast and the pixel density will have to improve markedly. The new contrast ratio of the pearl at 10:1 is approaching a level I would personally find acceptable, but I would like to see more like 12:1 or even 15:1. And then, I would like to see a pixel density of 300 dpi to mimic true print.
The eink version used in the 505 was had a background that was just too gray for my liking, and the ~170 dpi was close, but wasn't quite sharp enough for me at small font sizes.
I concluded that the eink technology just isn't mature enough for me to justify having a separate device just for reading. I'll be sticking with the all-in-one solution of the LCD-based tablet for a few more years until eink tech gets to the point where it is compelling enough to make me want to have a dedicated reader to lug around on trips in addition to a multimedia tablet. I'm looking forward to that time, because I really did like the concept of something that does mimic the look of print on paper. It's still got a little ways to go before it gets there for me, though.
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