I went from the 300 and 600 to the 350 and 650 for the clarity of the e-ink display and the font sizing. I found the touch screen on the 600 compromised the contrast in the display. The 350 and 650 have excellent contrast, like the 505.
I also like the selection of font sizes in the 350 and 650 (the 600 had it too) over the 3 sizes in the 505.
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