I came across this video while looking for pump videos. Doesn't working and training on a skill make you a better at it? I say pump does make you better in terms of using skill.
You snap shoot more, move aggressively, choose your shots carefully, and you have to be cautious on how many shots and air you have left especially if you play pure stock class.
Using a 50 rnd hopper on an Ego isn't the same as using one on a pump b/c their is no pumping action on an Ego.