So far in my first 1000 miles on these tires I was able to aggressively test them enough for handling and stopping on dry and wet road conditions to say that they performed much better than I expected. As for comfort and road noise, I would say the comfort ride level is above average and the road tire noise is fairly quite even with windows rolled down. As for snow traction I have no idea since I live in Florida but some reviews have mentioned decent results even though the DZ101 is actually performs best in warmer weather.
Now keep in mind, my 528it pretty much handles well even with worn tires so I think how your vehicle handles will be the overall deciding factor whether this tire is suited for you. Simply put, an aggressive driver with a vehicle with average to poor handling capabilities (suspension) become more reliant on the tires themselves and really should consider getting the best quality tires possible. I can bet some of the drivers who have been getting poor handling results especially in wet road conditions probably have their tires installed backwards. Remember, these tires are directional "Direzza" especially for hydroplaning and cornering.
Even though I am still a true beleiver in Michelin after all these years of trying some of the best tires on the market, so far the overall performance of the DZ101 has been impressive for the money spent and if they keep performing reasonably well I would buy again if I am on a tight budget.