I just commented on another post, so this is a copy-paste of my of other comment:

I use a Boox E-Ink tablet with the built-in handwriting notes app. It exports to PDF and I can copy everything to my Debian machine via ADB. I absolutely love it. E-Ink is close enough to paper for me, and the EMR (Wacom) stylus is close enough to a pen for me.

The device was worth every penny, even before considering the other uses for it.