How many of you”ll are familiar with or use the PLFA soil health test or Haney test?

I have used the Haney test for a few years. It gives me the courage to cut back on some fertilizer expense. I keep monitoring these fields with imagery and in season soil and tissue test just to sleep better and have a plan to fix any problems. So far it has worked like it was suppose to. I have found that corn doesn't need to be as dark green as I had thought it did. Its just another tool, use it and learn.