This allows you to get the dual axis spinning action you see on high end polishers for a fraction of the price.
Most home users just doing their own car don't need a $100+ professional polisher. This will allow you to get comparable results for a fraction of the price. The more expensive options will offer better ergonomics making them easy to use for hours at a time. If your only spending one or two hours a year there is no sense spending the money on a higher end polisher.
It installs onto your drill chuck just like any drill bit. Hold the handle steady and that's it. A fully featured DA polisher by using tools you already had. It feels well built and couldn't be a lot easier to use.