Firstbook.ai is a great tool for quickly creating an e-book. It is not suitable for incorporating and processing larger knowledge bases. The resulting text is, to my humble opinion, of upper-middle quality.
For my needs, the results were too rigid and too prescriptive. For example, I couldn’t change the structure as I pleased, as I usually can when interacting with AI, but could only regenerate it. Also, you can only edit individual chapters.
One issue is that the examples I provided were used multiple times in different chapters without building on each other or establishing a connection.
In a test project, I built upon the generated text and had to make so many changes that I didn’t save any time. For my needs, it makes more sense to generate the text in advance and have it proofread by the AI.
If someone wants to generate e-books without contributing much knowledge themselves, Firstbook.AI is a sensible solution.