The book was great in that he deals with how great the love and grace of God is towards His children. Tchividjian does a tremendous job of providing scripture and other relevant examples of how God deals with His children and doesn't give us anything close to what we deserve. Reading these examples and seeing the truth in them were very eye opening and helped solidify some of the questions I had been considering myself.
What I could not agree with however was the depth in which Tchividjian took his study. He seemed to border on jumping into a state of hyper-grace in which nothing a person does put one's relationship in God in jeopardy. At the heart of hyper-grace is the notion that nothing a person does can cause one's salvation to be null and void. While God doesn't give us what we deserve (wrath) and while He does forgive, excuse, and cover us in our frailty and sins while we are in right relationship with Him, Tchividjian borders on bringing God's relationship with people to a place where sin is excused if not seemingly embraced ultimately.
Overall, the book is very deep. It's not a long book (225+ pages), but it takes a while to read because of the need to decipher and consider what Tchividjian is saying. It is highly possible that I may have misread some of his illustrations and thoughts and if so then I would certainly apologize to him for doing so. Irregardless, the book is a great read in terms of grasping an in depth idea of God's love and grace and law.