From the the manufacturer's web site (dreamswing.com)....here's the down and dirty. And no, that's not me in the photos.

What Is It?

Basically, it's a compass for the golf swing.  Just as a compass for an architect or mathematician guides the pencil in a perfect arc, the Dream Swing does the same or your swing, keeping it on plane the entire swing sequence.

The Dream Swing Golf Swing Improvement System is a golf swing training aid that works similar to the way a compass guides and forces a pencil to travel in the perfect circle. It guides and forces the golf club to travel on the same swing path the tour players swing on. Therefore, the only way you can swing it is if your body does the same motions the tour players do. It virtually forces every golfer to practice a better swing guaranteeing improvement.

You can hit balls with it to engrain the ideal swing path and contact.

It can be easily adjusted and customized for each golfer's individual body type to teach them their best golf swing. The Dream Swing is engineered to adjust to every body shape and size. It is a fantastic golf training tool for juniors because they will enjoy perfect practice without the presence of a golf instructor. Golfers get tired and frustrated practicing mistakes. The Dream Swing will make each practice session productive. Every swing on the device teaches the student what is necessary to play better golf.

The golf swing is a feel motion. You can only develop the feeling of a better motion by repeating it. Because the Dream Swing forces and virtually gives you no choice but to swing on-plane, as you use it your mind and body coordination will automatically become programmed with the feeling of a better swing. It teaches muscle or motor memory by allowing it's students to feel the swing the pros swing. Besides improving your golf score it will strengthen the specific muscles needed to perform a correct golf swing resulting in increased power and distance, more control and consistency and better balance. It eliminates slicing and hooking and promotes proper tempo.

The Dream Swing forces students to do what the instructor tells them. This system bypasses the conscious learning, programming the mind-body-coordination with the feeling of the correct swing. It allows students to feel what the instructor tells them. In the golf swing it is extremely difficult to duplicate what you hear, but very easy to duplicate a motion you have felt.