Yes! It has totally changed my life. I think I am quite evangelical about it! But really the changes in my life have been very very good, and profound.
My T said that "standard" CBT would probably not have worked, and I neeeded something longer term and more in depth. But at the same time there are elements of CBT and the really specific skills for coping with life have been very helpful. The idea of the "lifetraps" has been really helpful to me and something I am able to share with close friends too.
I'm on 5 years and now I only go once a month.
I do agree with what JDNA said above though. At times the attachment to T has been very difficult and painful. I *think* I am just getting to the point now where it has helped but I'm not quite so dependent on T. With the dependency and the relationship though it has felt like two steps forward and then two steps back a lot of the time.