I listened to the audiobook and it was very good! It's definitely a Christian based book, but even if you're not of that faith and you're just in a relationship this is still a very good book to read about relationships, to better understand your romantic and familial and friendly relations. 

Chapman gives valuable insight into 5 major "love languages", aka the way people interact to show their love for one another. He breaks down how we can best demonstrate and cater to loving one another according to their primary and secondary languages, as well as how we can figure out what our main language is and how we can tell our spouse, S.O., all that good stuff, what it is and how we can maintain a happy relationship. 

It was a fairly quick read (listen), and I really did feel good and like I had learned a little more about myself and my fiance after finishing it.