Practical, easy to read, and well-researched!!! I highly recommend this book and its companion book, For Women Only ...! They are excellent resources for married couples to be able to understand and relate to each other better. Please be sure to also read the book intended for your spouse, since it will help you understand YOURSELF much better (why you do the things you do)!

My wife and I were going to be teaching seperate guys and girls Bible studies this summer. We bought this book, as well as For Women Only, in order to read up some in preparation to teach. We got a lot more than we bargained for.
On the one hand, this book will help neither of us much in preparation for our classes. On the other hand, it is a great book that I think every person should read. We began reading one night together, and almost instantly, our relationship began to improve. We didn't even have a bad relationship, but there's always room for improvement, right?
This book is easily accessible for just about anyone. The writing style is simple to read, and you will move along quickly. There is enough humor to make you chuckle throughout. While there are quite a few statistics, you won't find yourself bogged down in them. The research is done well and fairly unbiased. There are also some very practical things that anyone can do to help improve on their relationship.
My wife and I kept finding ourselves asking each other about the findings in the book. Amazingly enough, "For Men Only" seems to catch the truth about most women (just as "For Women Only" does about men). The writers are Christians (as are my wife and I), but they don't start with Scriptures to base their point. They let the statistics speak for themselves, and it just so happens that many of the results line up with biblical evidence.
All things said, it is a great book. It is a quick and easy read, as well as extremely helpful. If you are in a relationship, you can't afford not to read this book. My only suggestion is this...both partners need to read the volume for them together. It will open amazing dialogue between you.