Obviously not many miles yet. Today, I was out and about while a winter storm was beginning. It was cold out, so the snow was light and fluffy, not wet snow. With maybe an inch or two of snow, compacted in some areas, traction from a standing start was OK. Even with throttle modulation, there was some wheel slip invoking the stability/traction control. Even without electronic intervention, I felt as though there was a hint of step out to the right with the rear wheels. I felt as though there was a slight need to correct for this 'dogtracking'. Modulation was required while turning and braking as well, moreso than I would have anticipated.
Tire selection for the given size is a bit limited, but I had Dunlop WinterSport 3D tires years ago in the same size tires with a '97 BMW M3. I never felt out of place or without good control with that car and winter set up including getting caught in an unplowed parking lot with perhaps 6-8 or accumulation (enough so that I was 'plowing' snow). Even the SottoZero Serie 2 (225/50-17) on the E46 M3 I had the past few winters seemed to perform better despite being reviewed as being somewhat lower in performance.
Maybe it was just particularly slippery today. Others were proceeding with caution as well.
In dry winter conditions, the ride is a bit harsher than I would expect for non RFT, 50-series tires. On colder, wet surfaces (not freezing/icy), it is difficult to provoke the rear tires into losing traction under throttle, which is a pleasant surprise.
I'll return with further comments as winter continues and I travel more miles here in eastern MA, but so far I am disappointed with the performance.