Thanks Peter. I've never seen that design before. Looks like a bumpy ride. At higher speed I wonder if centrifugal force causes them to dislodge. But they do look effective. They would be good for the boondocks where there is no transit alternative, say the Upper Squamish valley. Or you could just take a car. I don't think I'd be motivated to get them for the odd day in Vancouver where I can't cycle commute due to snow. I just use transit on those days. Maybe the Ashlu Main after a pineapple express followed by a hard freeze. But then again, you could drive the road in those conditions.

I have used 43 and 35 mm studded tires on my bike for cycle commuting in the winter for the past 3 years (this season will be the 4th). They are overall great. No slipping on ice and good grip on the snow. The complains with them are loud, increased rolling resistance and cost. Of the 3 it is really only the sound that bothers me and it is not so loud. Cost is not that much once you spread it over the years. they were $80 each to buy so that is now $40 per year and I would expect then to keep going on after this season.

Biking in the snow is so much fun. they are only a few drivers and hardly a cyclist. This year I note that the city of Vancouver is putting brine on the bike lanes thus reducing my fun but increasing others fun and generally getting more people out biking. :-)

Schwalbe winter tires are available in various bike stores in Vancouver.

http://www.schwalbetires.com/bike_tires/studded

 I probably take transit about 5 days or less each year on account of snow on the roads. That's about $40/year but since on my bike commute I always take SeaBus on the way in, it is really only about $20/year extra cost. The thing that really bothers me is the loss of endorphins from the commute but I can live with it a few days a year. It is an opportunity to walk through the neighborhood and mix with the crowds on SkyTrain 5 times a year. The latter always reinforces the reasons why cycling is so much superior to other forms of city transportation.

for he few days you use transit... Check out TransitLive app. You can select the bus route you want and see a map of where all the stops are on that route and where each bus is on the route (updates up to every 8 secs). Pretty cool app.