To start out, let me say that being a Christian my review might/will be biased. =)
From the many Apologetics-jargon for defending our faith, not for apologising for it-type books this falls in the middle category in complexity, in evidence, and understandability. Having an analytical mind, this book was easy for me to read. Strobel interviews "experts" in their particular fields like Craig Blomberg (expert in the Gospels). Who in turn would give out the evidence, in Blomberg's case why the Gospels (Mathew, Mark, Luke, and John) are truthful and accurate. Other chapters deal with, archeology, psychology, medical view of death/resurrection, historical accuracy, etc.
I led a Bible Study with this book at UC Irvine, and the students were not fully able to understand the train of thought of Strobel in some chapters, which surprised me. However, they were excited to find more facts in what they believed.
Yet, this is a more complicated book than Paul Little's "Know why you believe" but definitely easier to digest than C.S. Lewis' books such as "Problem of Pain" or "The Great Divorce" (I'd have to read some sentences/paragraphs 2-3 times before understanding), or J.P. Moreland's "Scaling the Secular City" (in which after reading some paragraphs 4-5 times I would wonder if it was written in english at all, albeit an excellent philosophical book)
As this book is a "summary" of each particular topic, it doesn't go in-depth in any one topic, but it would be a great starting point as it has citations and references to 120+ "academic" books.
All in all, I think this is a great book for NEW believers, to re-affirm their faith, and answer their questions at heart. Can't really say this book would turn an unbeliever to Christ, but it might help for those who need questions answered. After all, God works in wonderful (weird?) ways.