I have a Boox note. I can’t help the feeling that it’s not entirely legit, but it’s Android, connects to any service I want (including a Calibre library), has a great display, is great for notes, and is all around fantastic. It’s not a tablet replacement but it IS a replacement for the stuff I do most often with a tablet (read and write). I thought the 10.3 inch display would make for a hefty reader, but it’s perfectly fine.