I just purchased my 2nd consecutive set of these tires in a 275-40/19 for my Brembo package 5.0. My spirited driving consists mostly of lateral acceleration and an occasional downshift around familiar curves. I know for a fact that I'm not pushing the suspension or the tires past their comfort zone, but enough to keep my wallet and I comfortable. Lol
The first time I bought these tires (December '12), I was at 27k miles on factory Pirellis. (Nothing like taking up two lanes with a 3rd gear downshift at 60 on a stock setup.) and immediately felt the difference, even during the break in period. I just purchased my second set (1/8/14 at 56k miles) and it reminded me of how much I love them. Even in Florida's random terrential downpours and nearly bald tires, the car wouldn't act stupid.
Not sure if I got the full experience from the original set either because within 2 weeks of getting them I took a road trip to Maryland/Pennsylvania (Mountains, ice, snow, slush, sleet, salt, the fun stuff. Lol) and they handled suprisingly well. 12/25-12/30 they handled snow suprisingly well. I was very cautious on the mountain (With a line of 4x4s behind me and a little bit of spin going up hills. Lol) Never once lost it or felt as if I would have needed to call the insurance company.
At 420/406 and just an Anti-Roll Bar kit (To take out the wheel hop from having a cheap factory single center mounted UCA.), I pulled a 1.97 60'/12.2 @ 116. Wheel spin expected, but happy for a street tire. Performs just as well on the street with some VHT. They lose their pizzazz after about 15k, but are still reliable for daily commute. From what I've read and experienced with them, they have a decent inner structure that leaves you confident in familiar corners. I say that because you never know what's around the corner and towards the end, my completely worn Brembos could lock them up (Feel the ABS pulse) at 30 mph.
(Running out of space) Great tire. Save yourself $800+ for upgrades.