I've slid about a bit in the snow and ice on my trike and it's a lot of fun. I agree you need ice spikes on the back to make any progress up a snow packed hill, however I reasoned if my front tyres don't adhere to the ice/snow then I'm not going to very good at stopping. Maybe I'm being overcautious.
I tried this on the Catrike last year and one tyre works well up to a point.
Traction is fine and it gets you going. The Marathon Winter is also as adaptable. Pump it up and it runs like a Marathon Plus, but with a buzz. Let the pressure down and the spikes come into play. SO they can be used through the winter season.
However I had two problems. At one point there is a slope that has a camber as well. I used to slide on this. Secondly on the steep hill coming down from work I found that braking was impossible as the front wheels simply slid.
As a result I equipped the front with Winters as well.
I will be repeating the process this year with both the Catrike and Gekko.
However it does take away the fun of a smooth ice area or fresh snow as you cannot slide and turn in the same way