I've gone through 2x sets of the SP's on my Ducati 1198...they are OEM tires from the factory. I wouldn't buy them at MSRP, but are a great value when on sale. The tire has amazing traction (dry & wet), very predictable and provides good feedback. The only downsides, poor longevity (like most tires in the class) on the track and they will square off if ridden purely on the street, as they are not dual compound tires like the Dunlop Q2's (another great tire).
This magazine review is ~14 months old, but provides good insight on the tire.
Pirelli Diablo Supercorsa SP Tire Comparison Review - Motorcycle USA