I found the essential premise of the book - which is that people give and receive "love" in different ways - to be very informative. I learned a little about myself and it gave me useful topics to discuss with my spouse that resulted in us learning more about one another. I can easily recommend folks in long term relationships giving it a read.

The text itself is not especially well written, nor are any of the themes backed by research: it is purely one counselor's experience helping heterosexual couples over his career. I was slightly put off by the repeated mentions of Christianity (there's no preaching, but church is mentioned a lot), and the author doesn't even give a nod to anything that isn't cis-gendered and heteronormative.

But even with those fairly minor reservations, I think this text is worth reading for anyone who has moved past the torrid romance and is now trying to maintain connection with another human long term.