Goodnotes offers a great digital note-taking experience, especially with the ability to annotate directly on books and documents. This feature is highly valuable for students and professionals who want to keep their study or work materials organized and accessible.

However, there are some limitations that affect the overall usability. One significant drawback is that Goodnotes does not allow writing in a fully formatted document style like a traditional word processor. This makes it challenging to keep notes tidy, symmetrical, and well-formatted, which can be frustrating for users who prefer a more structured layout when organizing their notes.

Another area of concern is the handling of the free trial. The current setup automatically starts the one-time yearly free trial upon account creation, which removes the user's choice of when to activate it. This can be inconvenient for users who want to explore the app first and save the trial for when they truly need it. Offering an option to choose when to start the free trial would greatly improve user experience, as the current approach can make the trial feel wasted if not used immediately.

In summary, while Goodnotes excels in many aspects of digital note-taking, improving document formatting flexibility and providing users control over trial activation would make it an even more user-friendly and appealing app.