I gave these tires a dry traction rating of 9. I am not sure how much of the performance is related to MINI and how much is related to Continental but I go screaming around 270-degree on ramp and there is no slip or noise. I take turns much faster than I did with my Impreza and BMW 330Ci /w Sport Package. I have not had a surprise when running at high speed in the wet and so far have not experienced any hydroplaning. We had over a foot of snow (Colorado Powder) and I drove around the block plowing with front bumper and all was OK until there ice below the snow and I got stuck. They are marginally acceptable for a thin layer of packed snow but not ice. Fortunately in Denver we have really good snow removal and the sun melts the thin layers of packed snow quickly. If you lived in area with snow and cloudy winter days, forget it. Forget driving on ice.
These are run flat tires so by definition they have a harsh ride and are much noisier than conventional tires. The tire has to support the car without air pressure. The MINI has a very stiff suspension so this only amplifies the noise and harshness. I can validate all the comments about ride and noise. At first I was ready to pull them off and exchange them for something else but the traction and corning is incredible I am keeping them. Its up to your discretion as to what is acceptable.
The tread wear seems to be doing quite well as there is still no noticeable wear front or rear at 3000 miles.
Conclusion: I like them but there is serious trade off between performance and comfort.