There have been some reports that excessive heat can cause issues with all eink ereaders.
I don't have my H2O in a case, I really dislike having to open a case to start reading. I've not had an issue with it showing any signs of wear and tear and it's been nearly a year. Though I am careful with it, and it's almost always in a jacket pocket (not shirt nor pants where it would be more likely to sustain some damage). Before the H2O I had various Nook eink models and the only case I had for them was a silicon shell. Again no issues.
Maybe I've just been insanely lucky, but I do at times wonder just how delicate the glass substrate really is, and how much comes from a slightly more rugged treatment of the device.
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