Looking at purchasing a rupes machine as my current torq x, just isnt doing it for me anymore. Figured I would throw a 3 inch backing plate on it and use it for small stuff/tight areas. Im having a hard time choosing between the mark ii 15, or 21 with a 5 inch b.p. (dont think ill like 7 inch pads). Now I see the mille is coming out as well but I know nothing about gear driven polishers or how they operate/differ from da polishers. The goal is to have a good machine for all around use that I can expand my skills with. Hopefully somebody can provide some insight