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Mike,
Gerry originally created the GD system specifically for amateur umpires. It's very easy to learn, creates a rock solid view of the pitch / strike zone & greatly reduces the risk of tangling with inexperienced catchers.
As an instructor, I have been teaching GD for three years now (Yes, I have the usual run-in's with evaluators). Almost without exception, every student that has been taught GD has stayed with it, even with pressure to change from evaluators.
The good news is that GD has now been accepted in our area as a standard rather than a gimmick.
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