The variation of the band pull-apart method has you doing regular reps, but slower than usual. This is more for muscle-building than improving weak spots or improving the role of the back in the bench press.
Depending on your objective, you can vary the approach. It's practically impossible to overdo pull-aparts, so use them often.
Think of this as the Cliff Note's to the Ian King 101 class. Here you'll find the highlights of Ian's training principles that have changed the way most of us workout.