Seems this thread was about originally a question about rotary polishes, but some of the posts reference DA polishers, which are not the same type of machine.
Rotary polishers only spin, like a pad on a drill, and are used for heavy cutting, but in general do not finish down to a nice polished surface, and can also leave trails or holograms from the spinning action.
DA or dual-action polishers, sometimes referred to as random orbit, have two movements, spinning, and moving randomly back and forth in an orbit. These polishes can remove heavy defects, but can finish the surface to a high shine due to the random pattern of movement.
For the hobby detailer, and some pros, only a DA polisher is needed. For most hobby detailers, and for all beginners, rotary polishers can be dangerous and lead to damage.
DA polishers can also be used to apply
waxes and sealants.
Our
Swirl Killer line of polishers are DA, and feature a long-throw, which makes them more effective. Unlike some of the budget priced tools, they are low-vibration.
Our newest addition, the
Cordless 15mm Swirl Killer has the benefit of working without the hassle of a power cord.
Our
line of polishes and pads are easy to use and very effective, with the bonus of being color-coordinated to make it easier to know what to use together.