I really enjoyed the previous book, Sprint, which outlined a process to run innovation workshops using a lot of methodology from agile.
This one covers a process you can use as a precursor to that process to get the basics right of your idea / offer. It does a perfectly decent job at doing that, but no more than that, and overall, I was a bit underwhelmed by it.
It's a quick, OK read with a decent process, some OK examples and a few interesting tips, but it has some clear flaws as an overall reading experience.
First, their basic template, which they called a Foundation Hypothesis, is basically a brand positioning statement and map given a makeover. No real problem with that, other than they keep implying this is some sort of groundbreaking new way of doing this, when in fact anyone who's worked in marketing or at an ad agency in the last 20 years will find all the elements very familiar.
If you're completely new to the topic, they do a mostly good job at explaining it, but if you've done positioning before, there aren't that many new ideas in here.
It also often oversimplifies how the process works, and when they do acknowledge that things might not always go to their plan, their basic response is - try it again, and trust us, we've done this hundreds of times. Not that helpful.
Overall, it also feels very padded out. There's a lot of repetition and a lot of images of their templates filled out with their examples, plus not especially helpful anecdotes about their childhood and their time at Google (they mention their time at Google a lot by the way).
It feels like they had an OK idea to start, but realised they didn't have a book's worth of content from it, so stretched it as far as they could to make it feel more substantial than it is.
I got this on a Kindle deal and got some value out of it, but I'd have felt short-changed if I'd paid full-price for it, as it's quite lightweight and beginner-level in terms of what it covers. A passable read, but no more than that.