I had a gift certificate and a nasty cold. I decided to use it and it was nothing special, in fact I left thinking "snake oil". The sales "pitch" is absolutely everywhere, the decor is like 90% sales (lamps, scrubs, etc). I had vastly different expectations to be honest. I got in the room and again, thought the whole thing was just junk science. There were three other people in with me.
I left in a rush and had I instantly been impressed I intended to buy some of the rocks for my home, but alas, I was rather disappointed.
I got home and had the first bloody nose in years. I otherwise felt no different. BUT, I woke up the next day feeling great. I no longer was nauseous, had no sore throat and no cold left. I was very impressed and will definitely be coming again.