Used this app for a year on an older iPad and loved it. Converting power points to PDFs and writing on them was seamless for any of my classes. Id strongly recommend using notability if youre using a third party stylus, if you primarily type instead of hand write, and record as you write in lecture.
However I have upgraded to an iPad Pro 9.7 and am now using good notes 4. Ive found it receives a lot more updates and is more comfortable to use with an Apple Pencil.
These are expensive apps but are big steps towards paperless!
Tjay8900 about Notability: Smarter AI Notes, v6.3.0