The JB also has auto-off which is enabled by default (I believe its set to 5 minutes of inactivity), though its a sleep mode and not a hard-core off-off. (Not sure if the Libre's is all the way off.)
AFAIK the JB does NOT have Text to Speech -- it plays MP3s. Entirely different.
Don't forget to add DRM to the equation if reading secure books is an issue for you. Lite has it in prelimary form, JB doesn't have it yet, and I'm not sure about the Libre.
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