I follow Bert's advice and like his drills. They have improved my game more than words can explain. As far as his #1 shot, learn it!!!!! There is no easy way to explain it's importance other than to learn it and have the confidence in a match to execute it and get the position you are looking for. If you look at the stun shot and a dead stop shot, straight in and shot from the same place this give you 180 degrees of area the q ball could travel. This shot will teach you how to make the q ball travel forward on any angle you please. For instance if you had a shot with 5 degree angle, the stun shot will teach you the finesse to make the q ball travel anywhere from following it forward with a simple roll to a stop shot and q goes 90 degrees from contact. You will be able to hit anywhere in that 90 degree quadrant. This is very difficult to explain in words. If you learn the stun shot the stop shot is a piece of cake.
The stun shot is a stop shot just at an angle.