This exercise is an example of how cable work has some advantages over a barbell in that the loading curve matches the strength curve, so there's constant tension on the delts from start to finish.
The other advantage is that most of the initiation of the movement comes at the shoulder joint rather than the elbow joint. The synergy between these two components makes this movement an awesome shoulder developer.
Originally coined "The Bear" by John Davies, this series of five exercises in one teaches the body to move with great ROM in a fluid, powerful, and fast manner. It's fantastic as a total body warm-up, improving overall power production and motor skill coordination in a short period of time.