I feel this is just too new.
It has possiblity.
When I used it, it felt like no one checked the AI to make sure it was not just reasking the same questions over and over.

It was.
I spent 45 minutes reiterating the same thing again and again.

I am a writer.
So, maybe if writing terrifies you and you are not concerned with output that is very repetitive this is for you.

If you are looking for anything that will have high quality to actually benefit your audience, I think the amount of time you will need to spend and the amount of differening data you will need to input...
Well, you would have already outlined your chapters.

At this point, if you are still stuck you can simply use another AI tool to flesh out your ideas more.

I do think this idea has merit and it may go somewhere.
But it may be offered at this amazingly low price because the developers needed a lot of people to enter a wide variety of subjects and see what their AI spit out.

In that regard, I totally applaud the developer.
I think using the appsumo audience as people to test out their product and give feedback so that they can work out kinks they may not have seen, but knew were there, is a great idea.

If they get Magic Bookifier worked out and bring it back, I will definitely give it a second chance.

And again, if I could have not given any stars that would affect the rating, but just my opinion, I would have done that.