z2 . .rotor . . spire . .
All built to about the same standard, all feed as fast as your gun can shoot, all work well . . odd breaks are few and far between . . . theres nothing in it, the deciding factor is cost and looks, with bz et all doing the printed rotors for 120 new at the moment my money would go there . . and it may infact go that way as I need a red hopper to match me new gat.