Wondering if anyone has researched in practice different variants of "Chi Machine" ie there are a number of knock-offs at various prices and I would assume of various quality. The "original" people have story of course about how only theirs goes at the special magic frequency and motion and any of the others can hurt you and will wear out quick. I have heard that some of them do have too weak of a motor/motion to really get the job done.

Comments anyone?