Some of the other machines offer multiple speed controls as an added benefit. Dr. Inoue's research concluded that too slow a speed will not produce the desired effect, and too high a speed can cause injury to the back, knees, shoulders, and also cause headaches.

We test and use all products before choosing the products that we promote on this site because we want to deliver only the best to our customers.

We have personally tried a number of these *copycat* machines ~ one of them threw my right hip out of place. I had it re-adjusted, and then tried the same machine two weeks later to be sure, and once again, it took my hip out of place.

One which is available has a very weak motor and a violent motion that has had many people complaining of injury. This one even comes with a warning that you could burn the motor up if you use it for more than 15 minutes at a time and don't rest it a half hour between uses. It also specifies that it is not to be used commercially.

Another one has 2 models one cheap one and a 'deluxe' model. They have a variable speed control and should be avoided because of this.

Another again has a variable speed control and an inferior product. It weighs only 7lbs. The Chi Machine® is 16lbs sturdy and built to be used in hospitals.

While this product may be slightly more expensive than some of the "other" chi machines®, it comes with all the research to back up its claims. If you still have more questions after you read the rest of the information on this site about other chi machines, call their manufactures or distributors, I am sure that you will have the same results that we did, there were no customer service technicians to answer any questions as to the validity of the quality of machine you will be purchasing. Our technical support staff is available through email to answer any questions you may have regarding the Sun Harmony® Chi Machine® that we offer on this site.