I use a variety of technologies in my teaching such as BodiTrak for tracking foot pressure during the swing and Trackman which shows many parameters of the golf swing.  From swing path to club head speed, it captures the ball from take off to landing.  If you want to increase club head speed to angle of attack, Trackman can track and provide instant feedback during a lesson. V1 is the video analysis I use to capture the swing and send follow up lessons.  We all are visual learners and V1 is a great tool to use.