"Grips ice better than anything I've ever used!"
I use these spikes to run mountain trails in icy conditions and they work great. In fact, I believe in them so much I bought a pair for my wife, and two children so that we could continue hiking/running all winter long despite the slick conditions. They slip on and off easy, but rarely while hiking or running with them. The only con is that sometimes depending on the moisture content of the snow, snow can get packed between your spikes and the shoe. You just have to stop and clean the snow off with you hands or stomp on a log.