"Dee Purist" vs Golden Dawn Enochian

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Leitch mentions that some mistakes were made in the interpretation of Enochian language in the Golden Dawn rituals, and according to him, his works are based on information that was shared with him by researchers of John Dee.

Now my question is if any of you have found differences regarding the use of one or the other; what impact have you seen it has to follow the "purist" side, vs the system of the Golden Dawn?