Simplicity, familiarity with the menu and user-friendly. It's easy to navigate, make changes and edit whatever you may need. Because it's used alongside Google, the document is always saved, so you don't have to worry about it.
There's nothing that I really don't like except perhaps the ability to create multiple signatures, but all-in-all, it's a very useful product that is plenty for an average user.
Anytime a PDF document needs edited or completed, this is my go-to without having to pay for extra Adobe services. Documents can be downloaded and saved and emailed as needed.