The problem with the snow-stud (for the orginal poster, I'm talking about the 26" model here, which is different)was the centre un-studded part of the tire was just too wide. The bike had to be tilted at a 45-degree angle almost to the get side studs to bite. In order to get them to bite with the bike upright I had to lower the pressure to the point where I was afraid of pinch-flatting.

The ice spikers were a much better tire, albeit way slower on pavement. I've switched to Nokian studded tires this year, I ran a Nokian 296 in the back last year and was generally impressed, so I went with a WXC330 for the front. They both roll a little easier on pavement than the ice spiker, which is an absolute beast.