That is what is so worrying, a few of these groups are started up with hidden agendas to promote the practises way of treatments and there is no one to govern them, it is these type of groups which leave CPer's with a bad impression.
Where ever you have vulnerably people there will always be these types out there to take advantage of them, going through a recognised pain clinic or organisation offering pain management courses is the safest bet, most follow the one model and as Mary said with a few tweaks.
I recently went to the 2 week Persistent Pain Program at The Pain Centre of Excellence on the Gold Coast. My pain obviously hasn't completely gone but it is much better and I feel like I'm living life to the full again. After being in chronic pain for years I was so miserable, but now I finally have my life back. I'm happy and looking forward to the future again and doing the things I want to do. They taught me how to manage my pain and be in control again. The staff were incredible. I would highly recommend it. Here is the link - I hope that many of you in chronic pain get to have an experience like me.