i've been throwing the same first run z-buzzz since they came out and have bagged 5 aces with it -- it's now my straight flyer/turnover disc. I can make my other (flx) buzz fly on almost any line I want. another advantage for the flx buzz is in the woods where it's softness keeps it near the fairway even when trees are struck.
For my throwing style, the buzzz is definitely better than the roc which starts to flip over (i've tried them all: kc, cuco, ontario, san marino, dx, star) on me when I throw over 80%. I try to throw flat, smoothly, with some snap. I don't try to hyzer flip them, I just release them on the angle I want them to fly. if I want anhyzer, I lean back and release on the desired angle -- hyzer, lean forward, releasing on the desired angle. if you match up your arm speed and snap, the buzzz will fly almost the entire flight on the angle you threw it on.
try both the roc and the buzzz out, one will feel and fly better for you, put that one in your bag.