Actually that Pricing isn't that good for a tire that's probably two years old. If my memory is correct the Original Diablos were Diablo Corsas. Then the next year came the Diablo Strada and Diablo Corsa III. The Diablo Corsa was still listed then but was on the way out. Then I think it was Diablo Strada, Diablo Rosso, Diablo Corsa III, then went to Diablo Rosso Corsa , Rosso Corsa II and Angel. I was getting the Diablo Corsa III's from NESBA for $179.00 for the rear last time I got one (admittedly about a year ago). In Contast you can get a SET of the new Shinko 010 Verge Radials for 200.65 Shipped.
Oddly enough, I just acquired a 2001 Aprilia RSVR that had a set of these very tires mounted. Tires look brand new but have a manufacture date of 16th week of 2009. I took the bike out yesterday to set up the suspension and almost got spat off of it riding at the same pace that I had comfortably ridden at only a week before on my Hayabusa on Shinko 010's. I had actually made several passes down my favorite road, upping my pace on each pass to get a feel for the suspension on the bike and when I decided to ride at my normal pace I almost got bucked off of the bike. I thought it might have been a fluke or some debris in the roadway so I tried it again. Approach curve, Pick Line, Set speed, set neutral throttle, tip in, start to pick bike up, begin to pick bike up, roll on throttle, BUCK BUCK BUCK BUCK BUCK, don't crash, clean out pants, repeat. Spent the rest of the day working on suspension settings and finally got it settled down to a slight weave but if I could feel that I was at the limits of these tires. Braking wasn't much better and it was really difficult to build confidence in the tires as much as they were moving around. Much more and I was going to be testing the abrasion resistance of my leathers.
I'm not going to argue if brand new fresh Pirelli's are good tires because I've ridden on them and think they are great. They are also 304.98 for the same size tires that cost $200.65 in a Shinko 010 or 011 and I would say, from experience, that a fresh Shinko is better than a 2 year old Pirelli that's been sitting God knows where and in what environment.