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The long-term durability of eInk screens is current an unknown factor. We know that the 1st-gen screens (such as that of the PRS-500) did fade somewhat over time (long-time board members will remember innumerable threads on the subject!). The 2nd gen screens that most of us are now using seem relatively immune to the problem over the 2 years or so that they've been available, but who knows whether the screen will last 10 years, or 20? Only time will tell.
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