I personally never used the hinge system (though I did buy a gift Kindle with a hinge cover). I need to be able to fold the cover back and that puts a strain on the the hinges and the Kindle (there were issues with Kindle case cracking because of the hinges).
I prefer the corner straps which have held up very well on my K1 and K2 M-Edge covers (Executive and Platform). That said, I'm holding out to see what new covers come along for my K3. I'm not too thrilled with the selection available so far.
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