I had this with an iPad Air 2 and thought it was great. Now, with the iPad Pro, a whole new user friendly experience with the Pencil and larger screen. Using it all the time and "experimenting" with things using the iPad and the Mac interface. Can drop PDFs into desktop and notate on iPad and discuss in meeting because they automatically update to iCloud. Later export to Mac and save to a final version.
Cant be positive enough.
Dtanner46 about GoodNotes 4, v4.9