I attended a 4-day intensive several years ago, and was generally impressed with the clarity and commitment I found, not only with Deida and his facilitators, but with the participants. That said, I'm not comfortable with any system that gets too dogmatic, and I sensed a tendency to insist on certain techniques and practices which I personally found somewhat over-the-top. My partner at the time had an even worse time of it; she felt some of the womens-only exercises were downright grueling. I think the books are helpful in themselves, giving couples interesting insights into relationship dynamics. Taking it further probably just depends on how much structure you feel you need.