FWIW...used the Rupes w/ Wolfgang TSR & FG yesterday; started out on yellow Rupes pad, ended up finishing using B & S Low Pro Maroon pad. Really liked the B & S pad, more so than the Rupes yellow as far as running the machine goes. Was a bit more forgiving of lackadaisical technique.
Did kill a Rupes yellow pad...think it was too much product. Mid cycle it started spitting out little tiny fragments of pad and then launched from the backing plate and sped across the floor, conveniently coming to rest next to a garbage can; Live and learn...