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Well, my Sony PRS-500 was purchased 5 years ago and it is still going strong. I suspect that the screen is darker than it was when I purchased the device and the battery "only" lasts 10 days between charges, with about 30 minutes of use per day. You also have to consider that is is impossible to switch it off and you only suspend it when you press power button. It "switches on" in about 1 second.
But ... at that time it sold for $350 - about four times the price the cheapest Kindle costs nowadays. It has all-metal case and from what I have seen on photos the screen is set into tough metal frame inside.
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