I put these tires on my 02 Audi S4 and could not be happier. I have had them for a little over a year and they have been great on the snow and slush we had here in the Northeast last year and great during the rain or dry during the rest of the year.
They did feel a little slippery during the first few days but they quickly broke in and the traction is great. I cannot hear any road noise from these tires either, which is good because that drive me nuts.
I have not had any problems with spirited driving well into triple digits speeds.
I have also put these tires on our 07 BMW 335i, my friend put them on his 550i, and another friend has put them on his Mazda Speed3 so far, and others are planning on doing the same with their cars when they need tires. You cannot beat the performance or the price in our opinions.
For those with run-flat tires and no spare I recommend getting these tires and the Slime tire repair kit. Since it is not an aerosol bottle like Fix-A-Flat it can be kept in the car year round and comes with the Slime and a small compressor. You will not miss your noisy, rough riding, and low mileage run-flats.