Modern golf instruction would say Jim Furyk has a golf swing that does not fit a normal mold or a normal looking style. He uses a double-overlapping grip and has a strange take away where the club goes up nearly vertical. But then, he makes an amazing move where he drops his right arm behind the right side of his body and then turns agressively thru the shot. As his right arm is trapped to his side, he stays down in his spine angle and returns the club perfectly on plane with a dead square club face through impact. His down swing is so good, that he has been known to hit nearly 50 perfect shots in a row while being measured by the launch monitor folks from Trackman.
An interesting comparison can be made by looking at Jim Furyk's impact position and then that of world #1 Rory McIlroy. They both have the right arm trapped to their side and are turning very agressively through the ball. Furyk's move is usually more precise simply because he has less speed than McIlroy. Right now Rory is on full go, staying in his posture and hitting the ball extremely far and straight.
If you are a player who likes to use your body for power more than your arms, then studying these two players will help you with your technique. If you are more of an arms player, however, this type of swing and swing analysis will not be very beneficial to your success.