I got a Supernote A5X to read papers - I’m very happy with it and wouldn’t want a tablet. I specifically wanted a dumb device dedicated to notes/reading that I wouldn’t connect to the internet, which really helps me focus. The eink display is easy to read and is a great break from screens, it feels natural to write on.
However it’s not perfect - eink has a small lag in turning pages, so if you intend on flipping through a ton of pages while coding that may be a pain. The searching experience also isn’t great, typing takes longer because of the lag. I use it as an advanced notebook rather than a smart device, and I love it from that lens.