FYI, you can also use torque control with the Castle Link settings. Personally, I prefer torque control over punch control. Punch control limits your power during acceleration (it limits rapid changes to throttle), and torque control limits the total current, and hence torque, going to your motor. Torque control is better IMO b/c it's smoother, i.e., it does not have that split second dead spot after hard brake and then back to throttle. Also, I have read that the ESC runs cooler as well.