As a professional working publisher, I enjoy seeing the features of your product. Being a huge Apple fan, I was horrified when they decided to kill iBooks Author. But then again, I was using that program like no one else... check out Masters of the Sun animated book on the Bookstore as an example... full of animations and VO, etc. I was hoping this product would be an alternative.
However, until it can support a few things, I can't use it for what I do. This needs to support HTML widgets. Period. For animated children's books, to manuals with user interactions, etc. many people need to use interactive elements for their publications. Then, if the world were a perfect place, this could either be export as one of the many ePub formats or exported as a stand-alone app. I understand the obstacles to what I've just said, and that's probably why no current app can do that... however, for publishing to truly live, someone needs to figure out how to do that. People search for apps a heck of a lot more than books, so if you were able to make these stand-alone publications with truly interactive elements like HTML support, that's a game changer.
