The continuous arm. During autonomous the arm would turn causing the chain to pop.
The pull arm worked every time to get a full pull.
The teeter-totter arm worked to an extent. Occasionally, one side of the arm would get stuck under the teeter-totter. Thus, causing the arm to switch the teeter-totter to the other team's color.
The feat-of-strength button pusher swung to fast and wouldn't completely press the button.