I can now report, based on experience, that the Dynabrade orbital conversion definitely "works" faster than the PC. I've been using the Meguiars yellow 8" pads...they seem to be ideal. With a final finishing product, the Dynabrade works noticably faster than the PC...and with a cutting pad and compound you can apply significant pressure and the difference is even greater. It is a bit unwieldy though. But on big flat panels...it is certainly nice to have.
