Neo is showing up in the Powersoft M-Force moving magnet subwoofers The magnet is moving and the coil is steady. it makes more sense to have a lightweight magnet. All the heat sinking is done on the permanent coil side, but they have to also cool the magnet. The new portable tool trend is "brushless" motors where the neo magnets rotate and coil is static. The big thing here is wear and tear, and also better torque control.