Just a brief breakdown for ya,.. the stock gravity feed is ok. itll do what you need it to do most times. The problems you will run into is misfires due to paintballs bunching up at the feedneck.
you could buy agitated hoppers, but they cost about the same as a Cyclone, and then you have to mind your batteries. and their loud sometimes.
cyclone feed is like a gumball dispenser. it locks in 3 paintballs ahead of your shot. then it basically rotates, sweeping the next preloaded ball into line. With a wider neck, its unlikely to jam, and almost guarantees that a ball will be ready at all times.
it doesnt need batteries, and uses minimal air from your gun when you fire. Its easy to install, and if you cant figure it out, theres a how to and were all glad to help.