FWIW, here's that review:

  http://the-digital-reader.com/2016/03/30/99721/

Results were:

  Test file Image only.pdf - text did not appear selectable, nor were any searches for text successful
  Test file Image-OCR.pdf - text could be highlighted (creating an annotation), selected for searching the file, and directly searchable

On a side note, it's been my impression that copy/pasting (in the ordinary sense) isn't directly supported on this device -- after I long press on text that is selectable, a "menu" of sorts with three options appears.  The "menu" lists "Highlight", "Search", and "Google".  AFAICT, "Highlight" is for creating an annotation, "Search" is for searching the same document, and "Google" is for using the selected text in the web browser -- though IIUC by making a query to Google.

If you're interested in large e-readers, the Onyx Max might be worth considering:

  http://www.mobileread.com/forums/showthread.php?t=267140

I'm a step a way from ordering one -- highly recommend checking out the content of that thread.

On a side note, if interested in the one with the campaign, looking at pages 18 through 20 or so of the aforementioned thread could be of interest.

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Ah, also, IIUC, one of the participating members of that thread may be posting a review of a preview unit before long.  I'm not confident but I think the person runs:

  http://the-digital-reader.com/