I have a set of Metzeller feelfree Wintec and I love them ! I think it's my 7th set for about 14 years, I kill them every 2 winters.
As I ride all year long, winter tires are a must. I doesn't often snow in Belgium but temperatures in winter often go under 0°C and no problem, I wouldn't ride on summer tires !
I even bought a set of spare wheels to make the change easy between summer and winter wheels.