So first off I really enjoy the product as someone who has a very large PDF library. This is a great alternative to what I normally do which is print and take notes but then inevitably lose the notes and have to start from scratch. I absolutely love the auto-sync to google drive.
I have two comments/requests:
#1 I second the several requests for better stylus integration and I think this is really imperative to the functionality of the program.
#2 I would really like to see more of a free-hand highlight feature that is available on other programs (Goodnotes, Drawboard). Its just a much better way to highlight than integrating into the pdf. I wish there was an option to either highlight free-hand over the PDF or to highlight selected text the way it is already set up.