As I am now in Norway, I put
these on my bike a couple of weeks ago. Yes, I know the OP asked about non-studded tyres, but, this is in response to
willem jongman wrote:Studs probably still have the edge in really bad conditions
The Continental Nordic Spikes are simply amazing. The first day I rode them in snow and ice, I decided at one point to get off and walk over a pedestrian & cycle bridge that had very icy conditions. I wasn't certain that I could get over, even with studded tyres. But... I couldn't walk up the bridge in winter walking boots, so I tried it on my bike, and I actually had no problems going over on my bike.
Last night I had a quick stop for some pedestrians, and I think that on my studded tyres, on a road with a light dusting of snow, I stopped more quickly than I would have on Schwalbe Marathons on dry tarmac.
It takes me about 10% longer to go anywhere (more in ice and snow), but it's still easier than pulling two children or the weekly shopping.

“In some ways, it is easier to be a dissident, for then one is without responsibility.”
― Nelson Mandela, Long Walk to Freedom