Frazerelli, my STABILicers worked pretty well on what was basically pure ice two years ago - would have worked better on the hardest ice if I'd had a little more body weight to use to dig them into the ice, I think, but I'm under 50 kg...
But they're NOT good on shiny polished artificial surfaces (or marble). Fine on un-iced pavement/road, but they make crunching noises!