Great video. So many people either get sloppy on sights at longer distances or try to make perfect bullseye hits on close hoser stuff. It's definitely a balancing act between speed and accuracy.
Good information PK. When I took a class with a USPSA GM he had me do this at 10 15 20 and 25 yards also moving sight sideways in rear notch. It really does help to see it and keep a mental note.