The sixth edition was invaluable in preparing for and getting my G.S.E.B., in Feb. 2007. The test and study materials are mainly based on editions prior to the 7th edition. Due mainly to Mr. Kelley's sudden passing. My guess is that he updated the material for the book, before he was able to update test and study questions.
The main difference, in my observation, between the 6th and 7th edition was that some material had been moved from one section to another, and the wording of some passages was changed in an attempt to clarify the topic.
The overall concepts of The Golfing Machine are very much intact. In fact, my 6th edition is still vry much in use today.
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