They are good, both the driver and 5i verion. There is an item to consider when using them: Do you roll you hands open as the first move to counter the initial hinge break? If so, then this will kill your swing. You need to set the tension to the correct tightness with the little wrench they give you. This way you can take the club back as a one piece move first without the hinge breaking. After that, if the hinge breaks at the top or on the downswing, it is a great aid because is should never break at those points.