I was using one of these recently (different brand, but essentially identical) and it broke apart and collapsed under me. I’m not particularly heavy. I landed on my feet, unharmed, but I would not recommend using these. A person who is elderly, or heavy (maybe lifting something heavy) could get hurt. If you have one and notice it is a little bit damaged from use (as mine was) it would be a good idea to trash it.
Edit: Jeninlb’s post above came in a moment before mine. Yeah, they’re not really safe.
