I have only used the orbital machine. I take good care of my cds, don't touch the center or lend them. The polisher is supposed to restore scratched disks to "like new" condition but I don't have a single cd with scratches so I can't tell if it works or not. I clean them when I buy them and they stay pretty clean. To be honest besides getting them to play right (Yes remastered cds), after cleaning and polishing, I haven't noticed any sonic difference. Do keep in mind that the one with the silver
portion out of round needed to be replaced, something Borders did to my satisfaction. The others did played ok
after cleaning and polishing. One product that I can tell you that do improve the sonic performance is a special marker with a green dye that is used on the outer edge of the cd. I got a demo at a high end dealer and bought a few markers, unfortunately I put them in a box that got lost. If my memory doesn't fail me the product name is CD Stop. Check you Eric Clapton cd on an orbital machine and see if the silver portion of the cd is hub centered.
Regards, Hector.