The L.A.B. DF3  -  Is there a learning curve to using it? When the original DF 2 was introduced it created a sensation.  The downside, it was rather large and a bit strange looking, even weird some would say.  But it worked well.  It was designed to eliminate torque and produce a repeatable swing.  Putts hit on the toe or heal, roll like those hit off the centre of the face. Mishits don’t matter.  But is there a learning curve in learning how to use it well or have we gotten so use to manip