Well, it's basically the same device, they just removed the sidelights. This allowed the touchscreen to be closer to the e-ink and thus increased contrast. The freehand notes and dictionary are software based upgrades.
The 600 has the exact same cpu, screen and the rest than the 700, they just installed a different "Operating System" on it. (I know, it's not actually a change of OS but the analogy stands)
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