I didn't have much luck with the snow studs. They did roll well on pavement, because the studs are well off to the side, but on ice they were barely better than a regular tire.

With a spiker on the front and the snow stud on the back, the rear tire would often let go and drift out enough that by the time the studs on the side caught the ice, the back of the bike was almost sideways, and I'd end up spinning around anyways, as if I had a regular tire on the back.

Maybe I had the pressure too high.

The durability was a little disappointing too. The bead came off the tire after only a few hundred kms, and the studs seemed more rusted than the other types as well.

Edit: on my last visit to MEC I noticed that the casing looked different, so maybe the durability of the beads has improved.