I have both a Bookeen Cybook Gen3 and a Foxit eSlick, which are earlier incarnations of the same basic Netronix design used in the Kobo. Those use simple plastic cases held together by four screws. They are considerably more flexible than the Kobo, and going through the Bookeen forums from two or three years ago shows lots more problems with broken screens than the Kobo has had. The Kobo case is thicker, uses an aluminum sheet reinforcement, and snaps together tightly around the entire perimeter. It is a much more rigid design, in my opinion.
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