I've been looking at Onyx Boox for when this Kindle finally gives out, thanks for the endorsement.
And no, I didn't buy the Kindle, somebody I know dropped theirs and messed up the finish and got a free replacement from Amazon. Amazon had them keep the old one and they gave me the old one. Still works fine many years later. I just use it with USB and Calibre, no wifi.
I've really gotta organise my ebooks in Calibre. With 429 of em might be a while though, lol.