Having spent much time in ZoomNotes, I can also attest to it as a feature laden app, more so than many. I especially dislike apps that put settings and selections fixed at the top of the page. I am annoyed to reach “up and over” my paper to get pens for example. ZoomNotes and Concepts have a better approach with pens on the left or right to allow two handed operation (draw with one hand and change pens with the finger of the other hand).
With ZN I would caution however that it has its own set of issues. The document management paradigm is … unique. The functions sometime work haltingly. And the UI is also … unique.
I used ZN on my iPad exclusively for a while to make simple and rough engineering-type drawings for lecture notes. I am now using it to keep hand written notes of meetings. I do not need text recognition, figure imports, and many other bells and whistles. With my new iPad Pro and Pencil, I am as curious about Notability and GoodNotes for note taking. But I suspect at this point that I will stay with the issues in ZoomNotes and find a workflow with ZoomNotes that I can use rather than try to learn something new.
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JJW