If you're looking to read some great adventure stories in places most of us will never get to see, you'll enjoy this book. Frank Wolf is obviously an accomplished explorer and he is a strong writer who is able to communicate his experiences in a compelling way. I always enjoy reading about people who have such a passion for the outdoors that they put themselves through seriously grueling situations for the fun of it — it's an interesting insight into a personality type that is so different than my own. However, I do have a few bones to pick with the book that kept it from earning the 4-stars I considered giving it.
I do wish that this book was all new material. Some of the chapters are articles previously published in magazines, so unfortunately there is a lot of repetition in terms of the phrases he uses and the ideas he discusses. I think I would have enjoyed the book more if all the trips were interwoven into a single narrative.
It's also one of my pet peeves when adventure books include a lot of proselytizing. You don't need to include comments about how greedy and materialistic the world is or how we need to scale back on development to preserve nature. The point of adventure writing, in my opinion, is to let the adventure do the convincing. If you paint a vivid enough picture of the incredible experiences you have had in nature and getting outside your comfort zone, people will come to their own conclusions about environmental issues. Unless you are actually going to go into detail about how to balance economic and environmental issues, I don't think it's useful to mention it at all. Otherwise it just comes across as simplistic and actually does a disservice to the arguments for conservation and sustainability.
At the same time, the shortcomings of the book are actually just interesting insight into the way Wolf's mind works. For example, he is convinced that we all have a primal need for adventure inside of us which can only be satiated by getting out into nature and challenging yourself; however I think there are many ways people satiate this need for adventure, from moving to a new city to getting married. As well, his writing often has the attitude of "why doesn't everyone just do as I do? The world would be so much better", but not in a conceited way; he genuinely wonders this. Similarly, I've found other explorers seem to be unable to understand the motivations and daily lives of the outside world. And that makes sense. I think people like Wolf are wired differently and that just shows from the fact that they go on these wild trips.
If you approach this book as a study of the mind of an adventurer as well as a log of some incredible journeys, you'll enjoy reading it a lot more.