It's been said often here, Buzzz and Roc are two different discs. Just because they're their manufacturers' flagship midranges doesn't mean that they're interchangeable.
This is a true statement. They are not even close to the same disc, physically and their flight characteristics. All it is is that the Roc is the most popular mid-range Innova, and the Buzzz Discraft's. To this day I still do not understand the "Roc vs. Buzzz" debate, as I believe its more of a "Innova vs. Discraft" arguement. Personally, if I could handle the big bead of the Roc I'd have both in the bag. Don't switch from your Buzzz to a Roc just because. Switch to the Roc because you need more stability. You will not get the distance you get with your Buzzz from your Roc, but its not far off. IMO, its all about the grip comfort.