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As the owner of an M90, and a Kindle DX, I find myself using the DX. Battery life is infinitely better. The M90 needs to be shut off (mine does, anyhow), or if it is in sleep mode the battery will be completely dead in 48 hours. Onyx customer support leaves a lot to be desired.
That said, there are lots of happy M92 owners in the Boox subforum. Which unit is better is very much a matter of personal preference.
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