First things first. Despite what the title may suggest, this is not just a 'Wild at Heart' spin off - it's a different book, with a lot of new content. I nearly didn't buy it, because I thought it was just a cash in on the last!
Eldredge has, over the last few years, delivered some key teaching for men and women on God's involvement with His people, and more specifically, on how men are called to live out their lives. He offers glimpses and encouragements to pursue a full life of adventure within Christianity, rather than mundane religiosity.
Way of the Wild Heart captures the six stages of a man's journey, from the beloved son, asking if he is treasured, through to the sage, passing on his wisdom to others. In his usual, gentle and honest, writing style, Eldredge takes us through these phases, introducing each, before highlighting the challenges to be overcome as we grow, in age, and in God. He delivers some wonderful truthes, and offers encouragement to pursue what really matters in the Christian faith. Although perhaps occasionally prone to over-enthusing about his own children's upbringing, the ultimate experience is one of leaving you saying 'I can live this way, and it is a good way to live.' There are three or four sentences that I found that, alone, would have justified buying the book. Once discovered, there are paragraphs and words that will become new strong points for your only daily relationship with God.
I think it is important to approach this book more as wisdom from a fellow believer, rather than something that will merit in depth study. It lacks the diversity of scriptural content that previous books have covered, and if this is your first encounter with Eldredge, I'd recommend 'Sacred Romance' or 'Wild at Heart' as being a better place to start. However, Eldredge has established himself as a man of good reputation, and sound teaching, and I would go so far as to suggest that this is yet another 'must have' addition to the Christian guy's bookshelf.