Welcome to MobileRead, Berniej!
I've done some comparisons with the 600 at my local Sony store. The difference in screen clarity between the 505 and 600 is minimal, no where near what it was between the 700 and the 505. I am sure you will love your 600 and the ability to "turn the page" with the swipe of a finger is worth the minimal difference.
Happy Reading.
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