My 15yo DD has been working with a hitting instructor (DFP'er @Mike-Coach-Q ) who teaches the HLP swing based on the instruction of TM. Over the past year of working with him, my DD's quickness and power have taken noticeable steps forward. Last week, my DD was telling me how she has never felt better about her swing. This was after a BP session where she was repeatedly driving the ball 220-250'.
Before my DD started working with this instructor, there were a few concepts about the HLP that I didn't understand, especially regarding the use of the rear leg and the rear hip socket pivot point/axis. My DD's work helped me see the light. I'm not sure how I would put it into words. It was one of those things that I had to feel, and then the dots connected.
Although the HLP is gaining traction in the softball world, there are still a large majority of coaches/instructors who are teaching the swing the same way it's been taught for decades - get the front foot down early, knob to the ball, snap out front, and downward barrel path to create backspin.
This was very helpful Eric, it's great to hear some personal experience! Thanks!