The CPS 3000 is an awesome gun if you don't like to refill your weapon all the time. This baby holds 2 Gallons of water, only rivaled by the CPS 3200, which also holds 2 Gallons of water. This is the gun to take if you will be fighting far away from a water source.
With Capacity, however, comes weight. the 3000 is one of the heaviest Super soakers ever made. Not to be used by people that tire easily. Also, it's almost impossible to run so you'll be walking around everywhere.
The range falls a little short of the other CPS models, but this is not a big deal, it still goes pretty far. There are 4 nozzle settings. they are 5x, 10x, 20x, and the hardly used Typhoon blast that shoots 3 streams of water in a triangle pattern.
The output is very good for a water cannon, but just fair for the CPS line. On 20x, the output is somewhere between the 2500's 10x and 20x settings.
If you want this kind of power, I would recommend you get the 3200 instead. It's easier to find, and has a sturdier backpack.