Yes I did the calmbirth course in 2009, can't recommend it highly enough. We did it over a weekend and I liked that format.
I honestly think it helped a lot and made a significant difference to my birthing experience with ds2 as opposed to that with DS1

Will write more later
i did this course at the same time as Pandora - it was a huge help! i'm the first to admit that i'm a rather anxious person, and i NEEDED help with those anxiety issues so that we could get the birthing experience we wanted. Even though I ended up with the cascade of intervention due to other health issues, I was able to stay calm through most of it. As someone prone to anxiety attacks, it was nice to not have one, even though things ended up outside of my control!!

i have also been through a lot of other stuff since the course, and have employed the calmbirth breathing/relaxation techniques to help me control the anxiety levels at those times - it's been invaluable!