They work!
These heel caps helped me to get through a wedding held on a brick patio. I felt much more stable than I otherwise would have in my 3&#34; heels, and I didn't damage my shoes either. I was pleasantly surprised to see that the heel caps held up for five hours of standing, walking, and dancing. At the end of the night they did look a little worn, though, like they won't survive the next event without the walking surface of the cap breaking. They might not do as well on less even surfaces, for longer durations, or for those who weigh more.
Rating: 4 stars