Yes I've just finished with a gestalt therapist. It was OK but it doesn't help you change negative thinking or anything. It's more a way of just getting stuff out there. My problem with it was, I could talk to the empty chairs and say what I regret not saying to people before, but I wanted to learn more how to say what I need to say to them in the here and now. Not have regrets like I have so many times before. Try it anyway, it is all in the moment so it's very experiential but doesn't promote change too much.