I've owned both, but now use a Spire 260. From my experiences, this js what I can tell you. They all can feed as fast as your gun can shoot, so no problems there. The opening for the Rotor is a bit small, so dropping paint on reloads w/ speedfeed almost always happened. Z2 opening is big enough to put a pod through, so paint always went in, with and without speedfeed. If you aren't using consistent paint, sometimes paint will stick in the raceway of the Z2 or jam up the gear drive of the Rotor. Only other gripe is the Z2 lid opens during hard slides and stuff, with or w/o magnetic lids. Just buy both and sell the one you don't like lol
Blood Fade Planet Eclipse Nexus Signature Series Director's Cut 1/2 aka "The Blood Nexus"