Looking through this thread, I guess I haven't expressed in depth my opinions of the Crystal Z Buzzz.
The Crystal Z Buzzz is a somewhat bizarre member of the Buzzz family. Crystal Z is bizarre itself, so that is probably why. For example, one year at Sunking's Red Hawk Amateur Championships they had Crystal Z Avenger SS's. I had some credit from a previous tourney so I decided to try one out because they had a nice dome, were fairly stiff, and felt great. At this point I was throwing all Discraft and using the ESP ASS, and it tended to get too flippy, too fast. I was hoping this Z version would be a better disc for longer. I threw it out at Red Hawk and was surprised by its stability. It had just a touch of high speed turn with a healthy fade. Overall it was very straight and glided decently long, kind of like an original mold Beast. I liked it a lot and started giving it the full test at all of my home courses. I threw it at a variety of speeds and on all kinds of holes. I had had it for about 2 weeks and I was playing on a windy day. The disc seemed to be less stable, but I wasn't sure. I knocked it pretty good off a tee and it didn't work the rest of that day as it was flipping on every shot. I chalked it up to the wind and went home. Next time I played the wind wasn't blowing and to my surprise the Crystal Z ASS was flying just like my ESPs. I put it down after that. The next tournament I played a guy in my group pulled out a Crystal Z ASS and threw a roller than flipped early and failed. This was about a month after the tournament that provided the Crystal Z ASS. I asked him about it and he told me that although it had started out more stable than his ESPs, it quickly broke in and now it was his flippiest and only useful for rollers. The disc still appeared almost new.
So anyway, the Crystal Z starts out as perhaps the most overstable Buzzz, but breaks in as fast or faster than most the other plastics. That's one issue I have with those Buzzzes. Flightwise they are different as well. They are slower and more affected by the wind. Because of the slow speed they need more height to fly far than other Buzzzes. Because of this and the stability, I often lead Roc throwers who ask me about the Buzzz in the Crystal Z direction. The discs do fly on nice, glidey hyzers when new, and break in to be nice glidey straight/turnover discs, but they suck in the wind. Overall, I think most the other Buzzzes are better choices for versatility and durability.