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.
related posts
Massive Forearms, Strong Grip
How to strengthen your grip so you can pull more weight. Bonus: Big veiny forearms. Check it out.
Tip: Master This Essential Kettlebell Exercise
Master the one-arm press, get stronger, and build your shoulders. It all starts with how you grip the kettlebell.
Tip: 8 Unconventional Core Exercises
Hit your entire core with these somewhat odd, but incredibly challenging, moves.
Sure Fire Fixes for Weak Points: Triceps
Four of Testosterone's hypertrophy experts take on the common problem of stubborn-as-a-mule triceps development.