Hey gina, just thought I'd chime in. Just finished Retro last weekend, had a very good experience. We did ours in Canada, but I'm pretty sure it's the same everywhere. One thing I will say though as stated many times on this site it is not a silver bullet, having said that it worked remarkably well for us so far (only a week has passed) but I will say that my wife was very committed and participated actively all weekend, I was very surprised and impressed by this.The techniques they teach you seem too simple, but do not underestimate the importance of them. Also, there are small exercises to do every day, you and your H are the only ones who decide if you do these or not. DO THEM! Also attend all post sessions if possible.
One last thing, even if your husband does not seem overly enthusiastic in the beginning try not to be discouraged, I seen so many men at our Retro weekend with the same negative attitude completely turned around 180 degrees...Amazing and inspiring.