Any marker with a big enough spring can shoot 437, if thats the reason you'd be purchesing an ariakon marker than i feel bad for the people you'll be playing against. Kamaka touched on this, many masks are only approved for play 300fps or under. Your very lucky you friends wern't kicked off the field for shooting that hot. You seriously endanger any and everyone who is on the field with you if you play any higher. Im suprised your friends who were shooting that hot could even hit anything. Paintballs being shoot above 350 are subject to different factors than paintballs being shot at normal speeds (250-300). Hence less accuracy.
Ariakon markers should be purchesed becuase of their realistic milsim looks and their performace values.
Look around www.ariakon.com/
. There is much information about ariakon markers and buying your first or another marker. If you dont like what you see than leave, but playing safe and having fun is what paintball is all about. Im sure Ariakon would agree with me on that.