Well this thread is really getting heated up !! I would like to add some comments comming from someone who actually manufactures pads for both machines (PC and Rotary). I believe that you cannot achieve the same results with a PC than with the rotary. That is not to say the pc does not produce nice results. However the rotary action and the heat that it creates is what truly produces shine, blends scratches by re-gelling the paint, breaks down the new generation of compounds and polishes that are made to dissapate with heat and friction, quickly,efficiently , and totally removes wet sand marks, and levels the painted surface. The pc simply does not. The pc is fine for applying wax and glaze and removing it without and fear of creating swirl marks, or burning the paint because it creates almost no heat. No matter how long you leave the PC also known as a DA (or dual action) it will not burn, but it will also not level paint. Thefitter's comments above that the PC is a sanding machine are totally true. That machine is made to be an orbital sander not a polishing machine. It has found a nice nitch as a fool proof waxing machine that makes applying and removing wax much less a manual effort, but it does not take the place of a true rotary high speed buffer in the hands of a skilled detailer.