This book is necessary if one is going to plan a trip into the mountains of Maine, especially if these plans include Katahdin, or Baxter Peak.
That being said, the one shortcoming which could prove dangerous is the description of Knife Edge. The book mentions how very narrow the ridge is in some places, and the obvious points such as do not attempt in windy or wet conditions. But these are the obvious details one will see posted on the signout board before even entering the trail. However, one point which is not mentioned is the fact that Knife Edge necessitates a series of handholds and footholds across it, especially near the Pamola side, with little to no room for error or else serious injury or death may be the result. I have trekked extensively in Peru and Nepal so did not really have a problem with the ridge (though admittedly it was very difficult), but found myself taking alot of time looking for footholds and handholds much more often than I thought I ever would. The book should describe in painstaking detail this dangerous aspect of probably the most difficult ridge in Maine. Quite honestly, I was surprised it didn't after I got down and reread the part covering Knife Edge. Because of this I am dropping my rating from five stars to three, as this omission could be hazardous to someone's health in the future.
Even with this being said, I would like to do Knife Edge again someday......it was an amazing experience. But the rock climbing aspect of this ridge should be spelled out in the book. This is why most people buy the book in the first place- to get a very good idea of what they will see on the trail.