These are excellent devices to provide you with secure walking in icy conditions but are a bit "heavy-duty" for sidewalks and roadways.  They provide an extra measure of safety on hard pack ice but are a bit cumbersome to tote to work or carry on public transportation.  They also fit very snuggly but take a bit more time than some other more "commuter-friendly" options (e.g., stabilicers lite)to apply.  But they're a much better option than yak trax -- they won't fall apart on you when you really need them.  They're probably best used for serious winter hiking.