I went straight into book editing mode, since I plan on publishing an ebook in the following months. The experience has been slightly frustrating. For instance

I went straight into book editing mode, since I plan on publishing an ebook in the following months. The experience has been slightly frustrating. For instance, Shift+Enter when editing the contents of the title doesn't work as advertised. And when trying various things in desperation/frustration, a section of text popped up on me from nowhere, and I couldn't find a way to remove it. I'd say the product has a lot of promise, but you have a long way to go until you reach MVP stage.