I bought this book on the strength of the comments on the cover by some very big firms and I wasn't disappointed.
It's a comprehensive review of the subject followed by the findings of some heavyweight research at a couple of famous business schools, unlike many business books, so it's not just opinion. It's also not like any other book in the field, bridging the gap between gathering market data and actually using it. Probably the most striking thing about it is that it actually defines what market insight is, which I'd never seen before.
I liked the fact that it was research-based with lots of "substance", but more important to me was the fact that it is peppered with little quotes and summaries so that if you want to skim the book you can still get a lot out of it. I also liked the fact it had lots of examples from all kinds of businesses. Given that I don't work in a huge consumer goods company, I appreciated the fact that their examples were very varied and that the answers didn't just involve spending millions on market research. Finally, I liked the flow-chart process for creating insight.
What didn't I like? There's probably more in this book that I can use right away, but thankfully they've put lots of those "useful if you want to go deeper" bits into boxes that you can skip over. I'd have liked a "here's how to do it in 5 minutes" chapter, but then, as the authors point out, I'm being a bit naïve expecting "no pain, no gain".
So overall, this book is definitely recommended if you work in marketing, market research, strategic planning or related areas. Market insight is a hot-topic in my business and I found that, having read this book, I've now got a good idea about how to actually get there.