I enjoyed the prose of this memoir/collection of essays. It is addition into the history of nature writers like John Muir and Aldo Leopold, both of which are mentioned frequently. I thought the concept of "geotheomorphology" was especially resonant and interesting. Some of the chapters about tourists on cruise ships felt a little dated and out of touch with my wilderness ethic, but I had to remind myself this book was published in 2005. It did feel like a good representation of the environmental climate of the 2000s and was striking how some of his predictions of dewilding are coming true. 
Although some of his ideals prickled with mine (I work in a field dedicated to outdoor access and Heacox is often arguing for less access to wild places), it was a good challenge and reminder of the power of wilderness.