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I forgot 4 things :
the weight : it has to be very light
autonomy : at *least* a whole day under *heavy* use (10 hours)
reactivity : impossible to read a technical document if there is lags while browsing fast through the document.
robustness : not very useful to have an ereader if we're afraid to carry it.
These criterions were so "obvious" for me that I forgot them in my first post. But they are in my opinion the most important ones.
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