I put my winter set on this past weekend.
I feel a difference in wet conditions for sure. So much better at water evacuation that previous tyres. Hydroplaning is a challenge for the winter tyres.
I can't wait for the first snow to see how they feel. I'm already impressed over the previous All-seasons.
Granted, I came from All-season, run-flat, practically bald tires (2/32nds left before replacing), so my driving experience should be very dramatically different.
edit: I almost crashed twice last winter with my previous tires. I didn't care though because I wanted my moneys worth out of those stupid ass tires that came on the car, but looking back I wish I would've upgraded sooner. Just something to think about.