Had my winter wheels (MV3 with Michelin Pilot Alpin) on for the last month and only really encountered 'winter' weather this last week. I have to say that I'm very pleased with the performance so far.
Car felt planted driving on fresh as well as compacted snow + slush & didn't feel like it was going to let go.
It was strange for me to be overtaking vehicles in snow without my butt cheeks gripping onto my seat in anticipation for the car twitching that you expect the first time you attempt this after the snow starts! This is usually followed by the sinking feeling of knowing that an hour of driving behind someone travelling 10mph slower than you're comfortable driving awaits because you're not happy overtaking!!
The argument on whether winter tyres are worth the outlay with our British weather will continue but IMO, I believe it's definitely worth the expense - especially if you do a lot of miles!