Hi MLDaeni,
I've had my 505 for several days now and have not regretted my decision once. While the 600 has many desirable features, and I would have especially enjoyed the annotations, the cost in screen readability was just too high for me. I now enjoy reading in bright light or (fairly) dim light and never have problems focusing on the words on the screen. I hope you find a reader that works well for you in the end.
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