Surely the SS is still a road tyre... I cant see it being anywhere near as track orientated as the a048/888/direzza type tyre.
They have the grip level need for track due to the dual compound, yet still have the treadwear for the road, best part is the tyre pressure is the same for track and road meaning they are hazzlefree to use on both occations.
Absolutely the best of both worlds.
I base this on having tried the following tyres on my Golf:
Bridgestone RE050a (worst tyre tried)
Toyo R1R (quite high noise level but great grip)
Toyo R888 (Great grip, high noiselevel, bit tricky getting the tyrepressure right)
Michelin PS3 (Great road tyre but lacking grip for high powered car use)
Michelin PS Cup (Very dangerous in the wet when not up in heat)
Yokohama AD08 (Excellent behaviour on the road, grips well in the wet)
PSS ( By far my favourite for road with a couple of trackdays as well)