Well, it's hard for me to compare, since they're the only snows I've had on the Z. I use Dunlop SP Wintersport 3D tires on my Audi S4, and they are better in deep snow, but not as good on ice. But that car is AWD, so it's hard to know how much of the traction advantage is driveline vs. tire.
I've had one hard winter and one easy winter with the Blizzaks. In the hard winter, I drove a lot on snow-packed roads and found it pretty easy to break the rear end loose. But I had pretty good traction, and I always knew what was going on due to good steering feel and feedback from the tires.
They are still very wide tires, which is not a great advantage in heavy snow. Foolishly, I did take the Z on one snowboarding trip, and got stuck in the parking lot at the slope. But a few guys pushed me out and the rest of the trip was not bad, despite getting over 10" of snow over the weekend. So I'd rate them a B+
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