http://skepdic.com/landmark.html (You can find their actual page easily enough, if you want.)
It was interesting. I am actually considering doing it. I went completely skeptical, more as a favor to my friend and as a new experience. It seems to fit with some things that I've known I needed to do for a long time and just never seem to get around to doing. Paying money for it might be a good way to get me to do it. And, while it doesn't seem to be for everyone, it certainly does seem that some people get a lot of benefit from it. Is it stuff I could do on my own? Probably. Is it stuff I would do on my own? Probably not.