I have a 24 mile commute (one way) to my college campus in southwest Wisconsin. The plows aren't the best at keeping some of the roads cleared, and they can remain in pretty poor condition for quite some time after we get winter weather. After having a few close calls with some poor-quality all season tires, I decided to purchase a set of X-Ice Xi3's for my 2010 Ford Fusion.
I've had these tires on my vehicle for about 4,000 miles now, and have driven through a variety of poor winter weather driving conditions. I cannot say enough good things about these tires. Traction in light and deep snow is excellent. As long as I have ground clearance, these tires will grip with minimal wheel spin, and get me through it. Braking is much better too, as compared to regular all-season tires. Ice traction is much better than all-season tires. Hydroplaning resistance and wet traction are also excellent.
When the roads are clear and dry, the dry traction is also excellent. However, when cornering or with steering responsiveness in general, these tires can feel a little bit spongy, as most snow tires do. However, I hardly notice it, and feel it is much improved over the previous generation of X-Ice snow tires. The ride comfort is excellent, and the treadwear is great (they're still practically new with over 4000 miles on them). These tires are also extremely quiet, however I have noticed they do make a little noise when driving on wet pavement, but even that's quiet.
In closing, I think Michelin did an absolutely amazing job with these tires. I highly recommend them, and will be purchasing another set of them once my current set wears out. These tires obviously can't overcome the laws of physics, give you perfect traction, and make you invincible/unstoppable in winter weather. However, with some winter driving experience and using common sense, they can make your winter driving experience much more enjoyable, and a whole lot less stressful.