I just did it in Shenzhen, a city of China, like 10 days ago. They told me their technique and machine was directly from the US. There's no difference i can see so far. I start to wonder if they're qualified or not. I cost so much. I heard people who did it in Thailand or China complaining about the zero result. Now I'm so confusing and want to know the details. If it's sure that it won't work. where is the best choice in America to do this?