I second this. Been using their Nova 3 model for a good long while now and love it, been telling people it's one of my favorite tech purchases ever. Running android and being able to sideload things is a gamechanger for e-readers.
Check out the channel My Deep Guide on YouTube for in depth reviews of the latest Onyx Boox offerings and how they compare to others though before you buy, apparently some weirdness in their newest model
Not to mention XDCC over IRC