Nice idea, not a great solution.
I used iBook Author to write a lengthy piece. The plan was to see if the program was worth using for actual ebook publishing.
On several fronts it is a reasonable effort, but it is lacking. The publication limitation to apple was known and not a major concern. The issues that I had are consistently the program comes up short. It is a good first effort but is limiting to the extent that I cannot recommend it in good faith. If you know you are never going to publish your work at all, except on your own devices then it is workable. If there is even the slightest chance you need to use other formats than look elsewhere. Too many options allow the author to format in different ways, while this is a worthy effort it is a lightweight solution. Considering this is from apple itself I am left wondering what the plan was.
And there are issues on the iP* side as well. Upload a new version and the comments that have all been deleted are now back. And, since the new version is most likely different they are also wrong and useless.
Look further afield than here. There are many solutions and iBook Author was not worth continuing with for me.
Hackness1231 about
iBooks Author