Truthfully, I don't know how well this book introduces Zen, but I do know that I really enjoyed it. All the Zen stories that I've heard over the years plus tons more are all presented here in cartoon form with short explanations by someone (a cartoon zen master I presume) who is explaining the story to a westerner.
One point that I have to make is how much more of an impact this book had on me after I watched Joseph Campbell's video series "The Power of Myth" . I read this book both before and after I watched the videos and realized how much more they meant to me afterwards and how great this book really is.
If you want to get even more out of this book, check out the Campbell videos, you won't be sorry that you did.
Interested in Zen? Put away those long wordy books by various masters and get this instead. This wonderful "comic book" may have fewer words in it compared to others, but it speaks volumes. The author has a great talent for taking a Zen saying and translating it into pictures that show the concept, making the experience immediate and not reliant upon language (which is very Zen in and of itself). This book would make a great gift, too, since it's beautifully illustrated and has the original Chinese text in the margins. If you're only going to buy one book on Zen, make it this one.