I've known two people who have undergone this proceedure. Both asked my advice before having it. Both looked upon it as a last ditch effort to treat their dissorder. When people are desperate, what can you say?
What I've always tried to do is get them to ask the doctor for the actual data on efficacy. This proceedure, in various forms, has been in use upwards of 80 years. Yet, I have never been able to find data relating to efficacy anywhere, and the two people who asked my advice were never given a straight answer on what is a perfectly normal, perfectly reasonalbe question that should have a numerical answer.
It leaves me more than a little suspicious that this "therapy" is in fact quackery.