Wheel of Pain is a move for Devil Jin added in Tekken 5: Dark Resurrection. It replaced the Demon Scissors move from Tekken 5. Due to it replacing the Demon Scissors move, the command is still the same.
When to use
It's a very good move to use when the enemy is down. During normal situations, there is nothing special about the move. This move is useless if the player fights against giant enemies like Azazel or Nancy.