When I was younger I was in and out of therapists only for the mere factor that I could manipulate them to believeing what I was saying. I would tell them how I felt but I would use reverse paychology on them instead of listening to what they had to say and following through with them. I did that until I found one of them that could see right through me. She opened my eyes to a lot of things I didn't know about myself and some that i did and didn't think anyone esle saw. She got me to understand a lot about myself and to be able to recognize why I did the things I did. Since then, I haven't seen one in a long time but I still remember what she had said to me and I learned a lot from her.
I think they are good when you can be hoenst with them and take what they say to heart and actually look within yourself. But you also have to be willing to see yourself and make the changes yourself instead of relying on others to do it for you.

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If you can't handle the thorns, don't crave the rose!!