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1. I think "best" is highly subjective. What I like may not be what you like. I'm good with the Sony lighted case but I wish there was an M-Edge Exec model for it.
2. Recommended temperature range is always inclusive, so up to 35 degrees C has been approved by Sony. Could 30 C have an effect versus 25 C? Certainly on your battery but that's not unique to an e-reader. I wouldn't worry about it beyond not leaving it on a car dashboard in the sun.
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