It's great stuff, Jeff is talking about but the style of writing is much more important to me. Jeff is also extraordinary here because he "eats is own dog food", he speaks about story telling while using stories. :-) Thats great. In the second part of the book, the story telling went in the background a little bit but it comes back closer to the end of the book. I also like his humor, on how he is interacting with the reader. It could be a bit more from time to time.

It's highly recommended if you need to visualize a part of a product or a whole product.