What kind of swing really works?

What works in the golf swing is repeat impact. If you can repeat impact, you will have a consistant ball flight. This consistant flight, be it high or low, or left or right, will allow you to play a good game of golf. But the easiest way to get consistant ball flight is to swing the club on plane.

The angle the club starts on at address is the plane angle of the swing. As the club starts back it swings up that shaft angle until it is parallel to the ground, when it is parallel to the ground it should be parallel to the target. As the club travels up from there it should swing on a plane that is above but parallel to the original shaft line formed at address. As it reaches the top of the backswing it should be parallel to the ground and parallel to the target again. The downswing should travel back in the same fashion it went up on the backswing so that the closer the club gets to impact the more the shaft returns to the position from address. The club should swing up and down in the angle from address with many planes but only one angle. The higher the club gets in the backswing the more above but parallel it becomes and on the way down it will travel back to its original position

But once the club is off plane, the remainder of the swing is dedicated to getting it back on plane before impact. And from all of my experience in anlayzing literally thousands of golf swings, keeping the club on plane throughout the swing is the most consistant way to repeat impact.