Even if it doesn't save the M it generally leads to a much better way of communicating that allows future contact to be much more pleasant. They have a high success rate as they teach couples to communicate in a non threatening way.
From what I understand, no-one is put 'on the spot' and couples problems remain private and between them - they are taught communication skills and reminded why they fell in love with each other. I haven't seen one person post on these boards that they wished they hadn't gone to Retro. Even if they didn't save their M they came away from it with something learned that helped in the future.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength