As a recent above knee amputee, using these walking sticks while learning to walk on my prosthetic has been extremely beneficial. Using a cane is awkward and not good for my posture.
It took about 4 months of constant use, but I finally wore through the tips. I tried other tips from various stores and they lasted maybe 3 or 4 days, at most.
When I ordered additional tips I accidentally ordered the wrong size. I sent an email and received excellent service and the corrected size very quickly. The quality is far superior, as are the walking sticks!