We tested: 4-GW in Graphite Design YS-5.1 graphite shaft
Company line: "The wide sole, low profile and undercut cavity produce high launch, greater distance and maximum forgiveness. Polymer topline dampens unwanted vibration. Urethane sole insert softens feel."
Our Test Panel says: Does what it claims; forgives and masks all sorts of mis-hits; predominant shot is straight and high; oversize but not overdone; feels as soft as a pillow; predictable, effective results; a monster from rough; relative lack of feel from 30 yards and in limits distance control.
Balls rocket off the face no matter how or where you hit it. C.J. Bush