I met a PGA professional today. Inevitably, The Golfing Machine was brought up. The pro said, "I don't do TGM". I asked, "why not?". He said because everyone he knew who had a TGM background taught a method. I was quite shocked to say the least. He then named a 'famous' player taught by a 'famous' TGM instructor and said he doesn't like this player's new swing. He then went on to say he doesn't like the way TGM says your elbow must stay on the plane line on the backswing.
He said he might "do TGM" in the future.