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The hardware for all three is based on the same reference design and perhaps were
manufactured in the same Chinese factory. The Jetbook Lite (JBL) is "Lite" because
it lacks the hardware for audio/mp3/audiobooks/music. It is also lighter in price
by not including a relatively expensive built-in rechargeable battery pack and
the circuitry to do the recharging.
In terms of product descriptions; "E-Ink" and "E-Paper" are not the same thing.
"E-Ink" describes a particular display technology, while "E-Paper" has been used as
a more general term, in reviews and wiki. The "E-Paper" technology that is used in
the reference design for the e-book readers you listed, is a reflective monochrome
LCD without a backlight. A number of us prefer this display technology over the
"E-Ink" display, but that may be more a matter of personnel preference.
You can not only change the batteries yourself, you can charge the batteries
yourself. Testing in the JBL so far, is showing that you can expect over 20 hours
of actual reading time, from the rechargable AA Batteries. This is about the same as
what the built-in battery pack provides. One big difference being that you can carry
a charged set of the rechargable AAs and easily replace them in the JBL, so that you
don't have to wait for it to recharge an internal battery. Charging "offline" is easy and convenient.
The units are also differentiated by the firmware installed to operate the hardware.
The JBL supports the eReader DRM, the JB supports none of the DRM scams, and you
have more info on the Libre's firmware than I. There are other features of the software
installed on the different devices that may or may not be factors you want to consider.
The JetBooks include translation dictionary support, for instance.
Given your location, you might want to check out the UTF-8 support, to be able to
read Arabic or Farsi ebooks.
Luck;
Ken
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