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.
Most strength coaches will categorize an athlete or client into one of three classes based on their responsiveness to training: easy gainer, hard gainer and average gainer. Let's take a look at each category.