The value is that if we can understand the unchurched a bit better maybe we will be more at ease with the Word presentation.
This is a practical book with many lists and their explanation. This is NOT a Thelogical work. Your Theology is left to you. He is simply giving some new and some old ways of doing evangelization but seeing the attempt through the unsaved eyes.
Chapter 10 has a list of 7 things a church should do; Chapter 9 has a list to help the spouse that is saved and married to an unsaved person; Chapter 7 shows there 3 areas or steps that a person takes on his journey to salvation. These lists alone helps you relax in knowing that even if they do not accept the Lord when you speak to them, you may see the progress they have made by moving closer to acceptance. Chapter 5 has 15 observations on the unsaved.This book is not a detailed step by step way to lead someone to the Lord. It is more a book to help us understand our target so we can be better prepared and less apprehensive in our task.