It was crossover design, so everyone got both the placebo and real treatment at different times.
They have since published their results which are pretty equivocal. I probably sounded a lot more enthusiastic about the thing when it was closer in mind; my life priorities have changed a lot. If you look at my posts in the UMich Bimodal thread in the Research News subforum, from the timeframe of ~2/1/2016 - 6/1/2016, then you can see what I had to say about it at the time.
No one is a good objective witness of their own life experience, except maybe the Dalai Lama, so "I think it worked" is the strongest statement I can reasonably make. I could tell you I
believe that, but, the thing is, I don't see myself as someone who has "beliefs" per se. I have a set of facts I believe to be true, until more data shows me otherwise, and then I have a set of things which I think are true, based on those facts, which are even blurrier. I think having "beliefs" is actually a pretty dangerous thing to do and contrary to a scientific view of the world that's subject to constant self-scrutiny and change in the face of changing information.
Their published data should be a hell of a lot more persuasive than anything I have to say, though