I have no reason to disbelieve those who say they have been helped. I think the profession over-sells what it would like to be seen as doing rather than what it actually does do. I wish it would admit it is a lot more stab and guess than they like to portray it as.
For me, it has not worked in the way the therapist tried to sell or some people here report. I have found a use for it and so it is useful and a sort of hobby because I like to observe what they do and how they do it - and how they respond when thwarted.
One of the biggest flaws, in my opinion, is that they try to convince people they know more than they really do and sometimes clients believe it and are harmed.