Having experienced getting stuck on a large hill in winter with summer tyres a few years ago, I have a full set of winters on a set of Monza's.
I know you can drive with snow on the ground and get through, but its not just about snow!!! Its about low temperatures, ice & snow.
It is really night & day, confidence under braking. Well worth investment.
The price on the goodyear ultragrip is a steal!!!!