the wall 2 speed is wayyyyyyyy more powerful, akin to the dr. dre beats headphones with double bass, earth shattering, transcendentally moving, beautiful in form function and spirittt. the only downside is it's not rechargable/wireless. The mini is still strong, though just about as strong as the wahl two speed's 1st, lower speed... and the mini gets me off in a minute or less. I haven't used the wahl 2 speed for anything but back massages, and would be very careful if i were to.