This is a great exercise for the inner chest area. Keep in mind that this is not a muscle mass building exercise - it's a movement that will give you better definition and muscle separation in the inner chest area. This is the exercise that will give you that "line" down the middle of your pecs and give your chest the appearance of having two separate superhero-type chest "plates".
Thus, focus more on form and pace and don't worry too much about going heavy on this exercise. It's a finesse movement and should be treated as such.