I have a 2008 1.4TSI Leon which has about 50,000km including 3 summers and 2,5 winters

on it.
I'm running 225/45/17 Bridgestone Blizzak Nordic's (mud &snow tyres, not with spikes) as winter tyres. They are designed to work best in Scandinavian winter conditions.
I live in Finland and we have variety of winter weather conditions in here. Sometimes near zero and icy roads, sometimes like now, we have lots of snow (about 70cm) which means there is lot of snow on the roads also. Two weeks ago it was -26 celsius and yesterday only -2 celsius... nice.
This means that driving is somewhat challenging at times but Leon handles it really nicely compared to some other cars. Even though my tyres are pretty used, about 5mm left compred to new one with 8-9mm...
I have driven different cars with different types of winter tyres all my life and the fact is that tyres play a big role and if you have snow or ice under them when driving, you should also have proper tyres to go with the weather. Summer tyres with winter conditions = disaster. And bad winter tyres are also as useless as good summer tyres.