On YouTube I have relatively often came across the tutorials/coaching videos of Lee Jae Bok, former Korean international player turned to coaching and all-round badminton ambassador. While his credentials look very solid I can't really figure out if his smash shot teaching is of true value or just an attempt at being original/less main-stream. All comments and opinions, particularly from players with a well trained, powerful, precise and efficient smash shot, will be highly appreciated. Thank you all in advance. Keep it flying!