Dreadlord is doing the Bradford press, even if he does not know it. Press from the front and lowered to the back and vice versa. Best to use a moderate weight as he does. That grip position can be a killer for some, so you might take care if attempting it. It would not be my first choice as an exercise to do for the delts. One of the better shoulder combo, that works for me anyway, is the PBN and Up-Right rows SS'ed. Or front press and Up-right rows SS'ed. And of course the front and PBN press SS'ed, but not in the Bradfore style.
I just about use the same weight in the front and behind the neck press from a power rack (though Mcgoo and I have never met). With the front version being a little more heavy. (we have a few guy pushing 275-300+ off the rack for the PBN...just the way it is) Trouble is most guy's seem to have a man crush on bench pressing and negelect any overhead pressing action. Too bad, their loss.
Might what to have overhead pressing the first thing in a shoulder workout, if wanting serious shoulder girdler mass. Leave the extensions movements for later (if you must do them at all), unless you are doing pre-exhaust workouts. My first selection would be overhead pressing anytime over doing flat benches. Inclines(depending on the angle) can be a different matter all together.
Some of the Russian and other eastern block Olympic lifters have been knows to jerk heavy overhead from behind the neck in training. As the good Dr Chimps suggest, the PBN is not for everyone. But for those who are constructed for it, it will strengthen the whole shoulder girdle when common sense is used. Good luck.
Side Bar: From what I have seen on a personal level (from working with BB'ers & lifters) I might suggest that bench pressing may have blown out more shoulder than overhead presses every have. DB benches seem to be more user friendly than a straight bar. Over use and abuse of BP's may lead to nagging and long time injuries. Just a observation and some experience gather my myself over a few years ...nothing written in stone.