Helpful little book. Careful distinction is made between sin and temptation. There's good theological grounding in the first three chapters, before getting to practical application. A strong argument is provided for Romans 7:14–25 being the experience of the unbeliever, but not normative for the believer. Many practical helps in resisting temptation in chapter 4. For the most part, excellent, and a book I'm sure I will be referring to for help, both for myself and others.
However, some parts could have been written more carefully. As an example, the author seems to indicate that repentance must follow sin more or less immediately or one is not a Christian. But clearly there was time between, e.g., David's sin with Bathsheba, her knowing she was pregnant, and telling him, his communication with Joab, his attempt to deceive Uriah, his murdering of Uriah, and finally his being confronted by Nathan.