Plane lasers work better imo...plus they are far more conveinant:
smaller and more portable
easier to adjust to each club
harder to practice INCORRECTLY with
Jim,
I think lasers would be the way to go, if we can be sure we are on the desired plane. How can we handle that?
Lay something down on the ground as a straight plane line and then just trace it and "look look look" to make sure you're on plane.
To be honest, just trace the line going back and trace it coming down and look in a mirror and make sure your right forearm is on plane. Simple as that, thats what i do and i hit the ball pretty well