When I'm on the field, I want max performance out of my paintball marker.  Part of this though depends on what type of hopper you're using.  If you've got a super fast Dye paintball marker, it would be ridiculous to load your paintballs with a simple gravity fed 200 round hopper.  That would be like putting average, low-end tires on a race car; you would find out soon enough the cheap tires are holding you back.