Kindle Scribe
I'll preface this by saying that yes, I know Amazon is bad.
But.
I love my Kindle Scribe. I've had it for a couple of months, and I use it almost every day. Initially I was going to get a Paperwhite, as I've had one before and liked it a lot. Cost was a factor: the Scribe is significantly more expensive than the Paperwhite. In the end I pulled the trigger, and I'm glad I did. All the basic functions - like, you know, facilitating the reading of books - work well. Battery life is good. I like the larger screen, and with a nice cover it is pleasant to hold or prop up.
I thought the pen capabilities would be a novelty, but I have used it more than I expected to. It's annoying that sticky notes aren't enabled on all books, but you can use the pen for highlighting in any book. I believe you can freely mark up PDFs, but I haven't tried that yet. The best thing, though, is the notebooks. You can make as many notebooks as you like, using blank pages or over a dozen templates. Writing on the screen feels pretty much like writing on paper. There's a handy selection tool and clipboard function, and you can quickly get an overview of a notebook's pages, and move them around as you see fit. You can export individual pages or whole notebooks as PDFs or as text. The OCR is pretty accurate, even when contending with my handwriting.
This has been liberating, as someone who finds it difficult to write by hand. Writing on the Scribe is physically easier than writing on paper - it requires less pressure, while still retaining a paper-like feel. The functionality of being able to easily erase things, move them around, and reconfigure entire notebooks at will, leads to me picking up my stylus when in the past I would have been more likely to open my Notes app. I'm still on Notes constantly but having the option to handwrite, or even draw, is really useful.