The Onyx Boox M90 does look good for reading PDFs. I haven't seen one in person yet, and the cost was a little high for what would be my 4th reader/tablet. If I didn't have anything and were starting from scratch, this is probably what I would have purchased for PDFs. It's still quite new so there are still issues to work out, but people seem quite pleased with the earlier, smaller Onyx Boox models. So I think it's a safe bet that the M90 will "get there" even if it's not there yet.
I recently decided between the M90 and the Asus Eee Note. Price was an issue for me, only because I have so many different devices I really wanted to feel I was getting something I didn't already have if I was going to spend a lot of money. But also, I came to this simplified conclusion: M90 (or Pocketbook 902/903 series, which I also looked at) were decidedly e-readers that happened to let you write on the PDFs. The Eee Note is an e-writer (electronic notebook) that happened to let you read pdfs and ebooks.
If I were buying my first device now and mostly wanted a reader, with some writing options, Onyx Boox M90 or Pocketbook 902/903 is what I would have purchased. But, I have an Entourage Edge that works perfectly (probably still the best PDF option out there, even though it's now discontinued) and either of those would probably have felt like a bit of a downgrade from the EE.
Because I wanted, above all else, an electronic notebook, I went with the Eee Note.
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