This Flex Dual Action Polisher is the ultimate auto detailing paint correction machine. There's a huge difference between the the Porter Cable 7424 the pads do not rotate, they oscillate in a random pattern designed to simulate hand application. The "throw" is not disclosed by Porter Cable but it is very, very small. With the Flex XC3401VRG, the pads do have a forced circular motion, they rotate or "cut". Plus, as the pads rotate, they oscillate, or move, in a random pattern.