Wow. I have barely scratched the surface of what this can do, and already impressed. The desktop application seems quality (still need to learn the ropes), the demos are amazing (though tricky to view initially) and the tutorials (which I plan on going through) seem thorough. I have been on Appsumo for a fair bit of time now, and can judge a great Saas when I see one. Just watching the demos made me inspired to become the next interactive kids book author. Great stuff!