Paintball loaders come in various shapes and sizes with many different features. The most basic is the Gravity fed loader. These just mount to the top of the paintball gun and you fill it up with paintballs and go play. The draw back is that paintballs can get in the way of themselves preventing them from dropping into the breech. In order to fix this, you just shake your paintball gun to unjam the balls, but as you were shaking, you could have missed a shot that could have changed the game. If you don't like the gravity fed loader, upgrade to a agitated loader which is motorized. These will stir up the paintballs so that you do not have to shake your loader to feed the paintballs. If you need even more serious firepower to get insane rates of fire, upgrade to a force fed loader. These will force the paintballs into your paintball gun and keep up with just about any paintball gun on the market. We also have a ton of upgrades and accessories for all paintball loaders. Increase your performance or make it more stylish.
The Eye Force loader feeds at a reliable 18 balls per second with the eyes off and 20 with the eyes on. More then enough for your needs.
Some of the top pro teams in the world shoot the VLocity loader for reliability and speed. Check out the VLocity Jr. for a version that easy on your pocket but not in features.