Well its not the veritcal feed that makes it shoot 10 balls a second.It depends on your hopper that you have the gun you have and the vert feed will obviously feed alittle faster.The normal vl200 hoppers suck because you have to shake the gun alot to keep the balls feeding.The Revolution 9volts feed around 8 to 9 balls a second if you can pull the trigger that fast, and the Revolution 12volt will feed around 14 to 15 balls a second.Now that dosent mean your gun will shoot that many balls a second with out breaking balls, depending on your gun and how fast you can shoot.Then theres the warp feed that can by a realy fast shooter put out about 20 balls a second.Dont get a Piranah, trust me on this! you will regret it!.The striker will go out on you realy fast and you will just have to keep replaceing them.Depeding on how much your willing to spend on a gun, well go for a auto-mag , you can usually get them for a nice cheap price and its a nice gun and can be upgraded very well.Buy a Spyder TL plus, all the spyder TL plus is , is a shutter with out the crappy ass drop forward and pressure gauge.Just get the Spyder TL Plus and buy a Kapp Drop Cradle system, it is the best drop forward in my opinion and i love it.And buying that TL plus, plus the that Kapp drop cradle system will only cost you a few bucks more then the shutter and your getting something better.Well if you have any questions just ask.