very well on ice and packed snow

The tires go very well on ice and solid snowpack. With more than 10cm loose snow to the profile sets to and they drive more like through mud. However, driving on asphalt is a torment. You can leave the ring quietly at home.
Therefore, the point deduction.

After the 3rd tour on the ground I missed the first two spikes. However, new spikes can be quite simple Reinsert the repair kit. My tip: equal mitkaufen

At much lower temperatures than -5 degrees spikes to use only a little on ice. A solid (not smooth driven) snow cover can be as well traveled with a normal MTB tire.