I spent a few hours with Hunter myself about two weeks ago. Never been more confident in my fundamentals (or lack of in his words). Now when something is out of line, I can find it, fix it and be on my way in minutes, not days like a traditional slump. And that is exactly what he said he wanted to teach me, just to be aware of my stroke... I lost a match against a guy I play pretty even with yesterday. Missed two "easy" shot and took a few minutes. Found the issue and beat him 3-0 and 3-1 in the next two sets, with me going 8 and out half the games. I would have never been able to find why I was off that quickly before Hunter's lesson.
+1 for Hunter's lessons.
Something to note , Hunter has worked with and trained with some great instructors. Stan Shuffet , Tom Simpson just to name a couple. So , it stands to reason not to mention the O.J.T. ( on job training ).