I have watched Stephen Sweeney become a fixture on the putting green at PGA Tour events over the alst few years. I had the occasion to work with him one event a year or so ago with a player at Wyndham Championship. I was very impressed by how and what he taught and how he used technology but kept the delivery simple. His players really roll their rock and he is making some guys become much better putters. If you want to score better, this is worth a listen.