What do you know about chiropractic services which deals exclusively with the brain-body connection?

I’m referring to a chiropractor that makes adjustments of the skull and the uppermost cervical vertebra (the Atlas). I’ve been told that this is done to allow the brain to communicate with the body so that it can heal and become healthy.

If you have been treated by such a chiropractor then please tell how it went for you. Is it worthwhile or a waste of time and money?

Thank you.