good point, but my argument is more that no reader in the Sony line has completely replaced the 505. They simply offer different things. the 600 lacks in ways that the 505 makes up for and vice versa. This explains a steady price drop rather than a plummet.
This contrasts the movement from Kindle 1 to 2. The only two good things about the Kindle 1 IMO is the expansion slot and the removeable battery. I could live without the expansion though.
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