I've been....it's great! There are many here who have experienced amazing results at Retrouvaille. The kicker is that BOTH spouses have to want to work on the R and go in with that mindset. There must not be an active A (3rd party) on either side.
The weekend event just kickstarts everything and lays some groundwork. The "real" work continues at home and at the post sessions afterward, where you will cover about 12 chapters of your workbook in 6 follow-up sessions.