Well I can give you a little bit more about use in high temperatures.
Original Nook, - does quite well. Take it in the Sauna first then to the steam room and no issues ever.
Original Glow Light, - seemed to do quite well, but one day inexplicably (and not at the gym) the screen died, everything else on it works.
Glow Light (white) - doesn't do so well with heat, freezes after prolonged exposure to heat but then does continue to work once cooled off.
I may have to try the Kobo now.
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