I started out with his books, and it made a difference for me. I learned some basic stuff about energy work there. It also fixed a problem I had with meditation in the beginning which had to do with energy getting stuck in my head. I guess he played a role in demystifying some practices, too.

Iron Shirt Chi Kung and Fusion of the Five Elements seemed to give me big results for a while, but I went a totally different route because I grew uncomfortable with his teachings.

So, I'd say the stuff is working, and if it's for you you have to decide for yourself.

Take care,
Oliver

PS - as far as I can tell andonitxo is a big fan.