Quick verdict
The public AI Book Writer page positions the product around transforming AI content into professional eBooks. That is a useful category, but “book generation” is not one feature. A serious buying decision should separate idea generation, outlining, chapter drafting, editing, formatting, export and publishing rights. If the tool is weak at the later stages, fast generation simply creates more text to fix.
Where AI book tools can help
AI is useful at the parts of long-form creation that benefit from structure and iteration: exploring angles, turning notes into an outline, expanding a section, generating alternative explanations and identifying gaps. It can also help creators repurpose material they already understand into a different format.
Where the workflow usually breaks
Long documents expose weaknesses that are easy to miss in a short post. The model may repeat ideas, change terminology, contradict earlier sections or invent supporting facts. A polished paragraph can still be wrong. The longer the book, the more important an explicit editing and verification pass becomes.
What to check before buying
Verify how much control you have over the outline, whether individual sections can be regenerated without destroying the rest, what export formats exist, whether you can edit inside the tool, what happens to your source material, and what commercial rights apply to the output. Also check whether the product requires separate AI credits or external API costs.
Do not outsource authorship completely
If the goal is a lead magnet, course companion or practical guide, your expertise is the reason the reader should care. Use AI to reduce mechanical drafting work, then add examples, decisions, evidence and context that come from the actual subject.
Who should skip it
Skip an AI book tool if your main goal is to publish large volumes of generic text. That strategy creates weak products and makes factual mistakes harder to detect. Also skip it if you cannot verify the current license and output rights required for your intended publishing channel.
Bottom line
The right question is not “can it write a book?” Most modern models can generate long text. The useful question is whether the tool gives you a controllable path from source material to a coherent, editable, exportable final asset.