Mick, I wasn't knocking the SZ on being able to cut that grass fast. I was just saying that there are a few other decks that should be able to as well since the machines run very similar engines, or in the case of the JD970, the same exact engine, and both the 7 Iron and the V+ are open designs like yours. I'd expect about the same results- going as fast as the RPM's would allow. I see the cup in the bottom of that blade. That's some real BS there, especially since they are what you have to have to make your deck work right.