In a pinch
These things are pretty light and unlike other options are compressible. I've taken them on several icy road and trail runs and they held up well.
However, with the recent snow I took them on a trail run and hike up Days Fork in the Wasatch Mountains of Utah. The conditions were icy refrozen snow and sun soft powder, with some bare rocky patches. Inspecting them post run, it would not be at all surprising to see them break on the next run if more rocks were involved.
Bottom line... when unsure of the footing you'll encounter and traveling light they do the job in a pinch and just might save you a hip flexor, or groin pull.
FYI: Had no problems with the product slipping off my toes. Perhaps, a smaller size would help those who had this experience.