Can anyone comment on how the durability of this case is if you fold it back on a daily basis? Has anyone used it long enough to notice any wear (cracks, breaking, etc) along the spine if it's done on a regular basis? I'm looking to pick one up for my PRS-650 (either lighted or nonlighted) but it's definitely necessary for me to fold it back, since I always need one hand free while reading on my commute.
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