I remained skeptical for a long time. Then I got one. I absolutely love it. In particular, the ability to have multiple notebooks with me and cross-linking via tags. And "infinite pages" lets you insert space in the middle of a page or continue moving down without having to worry about physical page sizes. I can also screen-share the tablet with the desktop app to draw diagrams on zoom calls.
Admittedly, it is only incremental over a spiral notebook and a bic pen. But they do that incremental thing pretty well, particularly because of their focus on the "calm tech" aspects and lack of mainstream ecosystem to track upstream.