Almost perfect (suggestions below)

This is likely the best Apple Pencil app for note taking (and Ive bought everything on the market). Unlimited vertical scroll, smooth strokes and an excellent, yet simple UI.

I teach math/CS at the university and I will be using this app as my golden standard.

SUGGESTIONS:

One thing that is missing is the ability to add custom preset for pens. I typically need a black, blue, red pen, and I dont want to have to open a menu to change the colour... If I have to do this often, then its too slow to change it from a submenu. Theres plenty of space left in the menu, and I think you should allow the user the ability to choose what to put there.

The option to have the toolbar on the left/right side of the screen (edit mode) would also be great. This would allow me to use my left hand to change the tool, while my right hand is dedicated to holding the pen.

Finally something that I loved from Evernote was "auto sharing" where notes in a notebook are *automatically* synchronized to, lets say, Dropbox.

drtaglia about Notability: Smarter AI Notes, v6.4.0