I do not have experience with Wintrac nor the Blazzak, but I had the Dunlop M3 on my '01 740iL and '03 M5. On dry pavement and low temp. (single digit to low teen), the Dunlop tended to trigger the traction control way too often while accelerating or powering out of turns. This was due to sudden loss of traction. In powdered snow, slush, and rain, these performed just a hair better than all-seasons tires (Kumho ASX, Falken Ziex 512 in my case). Didn't think they made a difference on icy surface either. I had Conti T810S on my '05 911TT and the difference was night and day. No wheel hops under hard accelerations on dry pavement, very gradual break away, and noticeably more traction. The Conti were also manageable on ice. This could be due to the fact that the Porsche has AWD and better weight distributions, but the Conti tires also have the latest continuous tread pattern design to work better with electronic traction control systems. I have driven other non performance snow tires (eg. Nokian RSi) and found, despite the lower dry pavement traction, still exhibits good behaviour with the car's traction control, proofing once again it is important to find the right tread designs to accommodate modern chassis dynamics.