FWIW the Boox devices are good and are in the 13" space, but my annoyance with them is 1) Android and 2) I broke the screen on my Boox Note 2, and there is no way to repair it, even a screen replacement is impossible apparently, so YMMV.
Yeah totally fair on both points. I'd bought the Note 2 before I'd heard about the GPL violations... Android is funnily enough exactly why I went back to the Kindle with the Scribe instead, though Amazon has it's faults as well. My ideal device for this space would be the reMarkable Paper Pro but with the Kindle app for reading books installed :)