I've been on both sides of it, I learned HE from Ernie Parker and Doug Finch when I was starting out. I read boardmembers post, not fully understanding it, I shelved it for 2 years before I introduced it to my 45 plus students. I had zero complaints and everyone of them improved in either speed or accuracy or both. However, I did have one student that never fully converted to IR. HE snap, peel drop pitcher that I clocked in the 10th grade at 63 mph several times. I thinks she could have exceeded 65 with IR. My assistant coach who is a men's fast pitch pitcher looks so natural and smooth when he whips and snaps the ball, I couldn't imagine him trying to do a hello elbow follow through. I'm still learning and improving as a coach, but for me IR was the best thing for me and my students.