Rob, I am afraid that I can't give you anything as useful as numbers, but the Sirocco makes my eyes water and the Roadster didn't. Any faster and I would have to have something to limit the air going up my nose. All in all, I cover a great deal more ground.
In nil wind, compared to the Roadster the Sirocco is really easy to get up. I normally fly in nil wind, or very close to nil wind, so this is important.
Up in the air, if you want to throw it around it is so much more agile. Minimal input and you are on your wingtips. However, and I don't understand this, I have to work much harder to keep the Sirocco in a spiral dive than I did the old Roadster. The Sirocco wants to exit the spiral.
Ground skimming, I found that with my Roadster that it took all my concentration, the wing wallowed and I had to anticipate. The Sirocco is like it is on rails, very crisp and responds immediately to input.
To put this review into perspective, I am an intermediate level pilot and only have +/-200hrs...........so take it with a pinch of salt.