Just got a set put on my Z4 this past weekend and it was just in time. I work the night shift so if there is bad weather coming I usually drive my wife's Honda Pilot 4WD. However this past Sunday morning nothing of note was forecast (a light drizzle) so I drove my Z4 to work. At 4am an ice storm hit St. Louis and I thought I was stuck at work. I finally decided to give my new DWS tires a tryout in icy road conditions and they were unbelievable. I-64 was closed in one direction while I drove in extremely slick conditions going the other way. Only once did I experience a slight little slip on a big curve where all the accidents were occuring. I let off the gas pedal and drove a little slower the rest of the way home without a hitch. I think these tires work best for a small lightweight car like a Z4. For heavier vehicles they may not perform as expected. I only have 200 miles on them but so far they have been worth every cent.