I play out my games and have thought since moving to v21 how the ball movement seems more realistic.
I have my players at "normal" size and game speed normal and, other than the glitches (player through wall, etc) I've been very happy with v21's ball movement. One or two hoppers, balls hit into the corners and more have seen nice improvements IMHO. I actually have a camera view I made to watch some of the popups (I've always liked seeing major league popups IRL) and I replay them often. I've only had one that I thought went so high I found it unrealistic. The rest just look cool