This looks amazing. It was about time for the publishing world to bring disruptive ideas onto the table. From what I understand, you will be able to read your books on all devices which is definitely something that appeals to me (I hate Kindles!) Will explore the website a bit more - I see you can also read the first chapter for free.
What commonly used device doesn't have a Kindle app?
I think the appeal of this is that the books are enhanced, visuals, pictures, diagrams in full colour and optimised for the web, etc. - something an .epub file will never achieve.
I don't really want my books "enhanced".
Standard epub handles full color illustrations just fine, by the way.
Looks great, except the fading of the main part of the screen when the footnote displays. Gets annoying fast.