The Z Buzzz SS is far domier than the Fuse, and a little slower. I think this greatly helps with the slow speed stability. My Fuse, whatever line you put it on, it finishes there. The Buzzz SS, it will hold that line for the majority of the flight but will try to correct itself at the end. I find this more valuable because it means that I do not have to be as perfect in its release and if it is released on an anhyzer line, it is more likely to finish flat on the ground than hitting on edge like the Fuse. This reduces nasty skips, hops, and roll aways. When it comes to snow, that also means that it is less likely to slice under it.
What I really like about the Z Buzzz SS is that when thrown with lower power it is not that much different than a normal Buzzz, so it is capable of handling those shots especially at closer range, but when when thrown correctly you can muscle it too for some great distance.
I had it out at Blue Ribbon Pines a few days back and used it as my only mid (carry four discs total). There were a few drives with it that I would like to have back, but it was pure money when it came to approaches. It worked really well when I needed a perfect shot and I had to stand and deliver because of my footing.
Now, it seems to have the perfect stability for me right now. However, I am curious how it will handle warmer weather in a few months when all discs lose some of their stability.