Have a read of this thread:
http://www.seatcupra.net/forums/showthread.php?p=2180723#post2180723
People tend to think of "Winter tyres" as "Snow Tyres", and because we rarely get snow here, there's no real benefit.
That isn't the case - Winter tyres aren't specifically for snow - they are for general winter driving conditions - ie cold temperatures, wetter roads, and occasional ice and snow.
When temperatures drop below a certain threshold (typically 7ºC) the rubber in summer tyres gets harder and grip falls away - the rubber compund used in Winter tyres is designed to retain flexibility & grip in cold temperatures.
In the UK this typically applies for around 4 months of the year, Nov/Dec - Feb/March.
They are also designed to clear away large volumes of water and slush, much more effectively than summer tyres.
Finally, when you do get snow, they are in a different league altogether...
Cost ? Well there is an initial outlay in buying another set of tyres - but while using winter tyres, you're saving your summer tyres - so the long term cost of winter tyres is little, if any, extra.
The only extra cost is either paying someone to swap them over, OR buying a second set of rims.
I find it surprising in the UK that people are willing to spend a fortune on mods to increase power, braking & handling - yet are reluctant to buy a set of tyres that would A) allow effective use of those mods, and B) make them less likely to lose control & crash.
There also seems to be a misconception that ESP etc will somehow make your car better at driving in snow & poor wintry conditions - it won't. You can have all the fancy electronic gadgetry in the world, but if the tyres have no grip, it's no use at all....
My
Ibiza and both Passats (all 205 width tyres) have been ridiculously crap in snow, the tyres are too wide, spreading the load too much, preventing the tyre from digging down and gripping. 4 different makes of (summer) tyre were all just as bad as each other. Previous cars with narrower tyres have been much better.
The Dunlop Wintersport 3D's I've got now are brilliant. Much less wheelspin out of junctions, they slice through standing water & slushly outside lanes of dual carriageways that no-one else dare use, and in the snow the other week - unstoppable. The Toyo SnowProxes I had once before were good, but these Dunlops seem in a different league. They are topping all the winter tyre
reviews. Presumably the reason why they are on back-order in the UK...I ended up buying them from mytyres (delivered from Germany).