After 2 weeks of driving and one autocross, my reservations about this tire have receded. I read the reviews and felt comfortable enough to purchase them, mainly because they were the only tires that worked for autoX that were in my size. My concern stemmed from most reviews were on light cars and Mustang is much heavier. After an my last autocross, I am very happy with them. The weather changed from sunny and warm to cloudy and overcast and I felt very little change in the grip and feel of the tire. The OEM Pirellis were much more sensitive to weather changes and did not provide the same grip. Needless to say I am very happy with my choice.