Another factor is the number of columns in academic papers. In my field, most of the papers are formatted in two columns. At least for me, two columned papers are hard to read in my Entourage Edge (EE) which has 9.7 inch 1200*825 resolution Vizplex e-ink screen. Onyx M92 has the same size and resolution screen but with newer screens (Pearl) so it might be easier to read two-columned papers than EE.
If most of the papers in your field are formatted in one column, you will be all right. However, if not, I would recommend trying various PDF papers in your field to find out whether you can comfortably read them before purchase.
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