I've found the program to be very interesting.
It's funny, because many of the changes I've made with the program have been on a very subtle level. Many problems that went away were simply a result of me getting in my own way, and the program simply helped me get out of my own way.
A lot of changes that go on with this course, when I use it, are of an unconscious or semi-conscious variety ... so my ability to speak of them is rather limited.
What I can say is that it is very good at helping you harmonize the various elements inside of you, your life, and your personality. It helps you find balance.
I have not used it with relationships, although I am sure it has helped my moods and stress/relaxation level and those factors have had a bearing on the quality of my relationships.
One thing that I have personally found very helpful and meaningful is to read some material having to do with paradoxes and human behavior.
Paul Watzlawick has a number of good books. Ultra-Solutions is one and another, The_Situation_Is_Hopeless,_But_Not_Serious (The Pusuit of Unhappiness) is really funny and poignant.
I really recommend getting that book by Watzlawick. It'll add a different and interesting perspective on the course. 
