Like how PA4 communicates to driver in ice or snow conditions. First winter on the PA4 but has proved grippy and secure. Can tell when tire will break away on fresh or packed snow and what it takes to bring it back. More sophisticated than an average snow tire. In times past used Nokian, Blizzack, Dunlop, and many standard or high performance snow tires on various vehicles. Thus high expectations, even though there are few reviews of PA4. Interesting that Porsche had been involved with development too. We usually have traction control devices engaged in cars --on mode when entering harsh weather. Recently, however, have been turning off DSC in Bimmer sport-wagon, as control and performance of vehicle seems even better with PA4's. Car handled better without using DSC. Added control with such throttle response has been fun and added new dynamic. Generally enhanced winter driving experience in the 5 Series wagon with sports suspension. Rear wheel drive BMW has been easier to drive fast in snow and ice latley, yet with more control. Car more predicable now. Cornering to date has been superb in dry/wet conditions and the sidewall feels firm while offering quiet, comfortable ride. Have not pushed tires too hard yet, as want to give belts and rubber break in period. Yet already feels like an Ultra High Performance tire with intriguing winter capability. Have not yet finished testing and haven't been in really deep, heavy snow, but if these are first indications of what to expect then we're excited. For higher performance, lower clearance vehicles this should be a serious candidate for winter consideration. Looking forward to also trying the Michelin Xi-3 on other cars, as we are also big fans of the Conti Extreme Winter Contact which was very impressive on a Saab we own. That and the PA4 seem like the real leaders currently. Shall report back as we find out more about PA4 on BMW. Thus far does seem like a game changer in winter segment. Thanks Tirerack.