Having gone through three sets of tires, the original run flats, and two sets of Goodyear Eagle f1 all seasons, the Continental DWS have been the best all-season tires for my z4!
I average about 20k miles a year and am finally looking forward to putting those miles on these tires. The Goodyear's were great, handled well, in dry, rain and snow, but the road noise was unbearable. With the Continentals, you can actually hold a conversation, while driving, top up or top down! Having the sport package on my Z4, I figured I was destined to live with a harsh suspension, with the Contis my Z4 rides so smooth, so quiet I am now hearing the audio capacity of my stereo! However the smoother, softer ride has made me slowdown in turns and curves that I have taken at speed with the other tires.
I have driven through four days of torrential downpours in the Midwest on two different occasions since the tires were installed and the performance was absolutely flawless, as if driving on a dry road.
I have not driven the Continentals in the snow, yet, as I just had them installed this spring, but the reviews here are placing these tires higher than the Goodyear F1s and they were pretty impressive, so I look forward to winter driving and will report on their performance then.
I will definitely buy again and highly recommend these tires. I had done research on these tires for some time and was even more convinced when the tire dealer showed me that he had them installed on his own BMW, reassuring to say the least, and he has been pleased with their performance and has purchased several sets.