Originally Posted by Radiation Joe
You really have to be pretty hard-core to run them on the street. They hydroplane like nobody's business and slip/slide all over the place in temperatures below 50 degrees. They are responsive and make the car very darty in day to day driving.
I have them on my E92 M3 when I bought them in London a few months back. 2000 miles and the thread is nearly half gone. Really hard to use them in the damp not to say wet, as it is so damn slippery.
In the dry - now thats a different story. I personally find that the Cups have so much grip (probably at least 20% more). Finally swap them out (including the wheels) and save the Cups for track days.