Alberto's book is not only valuable, but it was an easy, and entertaining read. I shared this book with my team, and it saved us both time and money. I got a sneak preview while working at Google, and his description of pretotyping led us to build ever 'leaner' experiments. It led us to cut short some experiments before they even got of the ground (and wasted time), and helped us refine our more valuable ideas and designs in realtime.
In the era of lean startups, and lean projects, this is as lean as gets. These techniques are useful in todays 'fail fast' world, and especially mobile, where the utility and usefulness of an app should be thought through before getting to the code.
You know someone is on to a good idea when it seems obvious after reading it, and pretotyping is one of those ideas.
I highly recommend reading it, and trying out Alberto's prototyping techniques.