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I bought this because multiple members of our household have regular concerns with injury caused by mobility issues. I hoped this would help prevent wrist/hand injury that kept occurring for one of us. However, I (the one without hand-related mobility concerns) am the only one who can get it to work. The material used frays easily, causing it to snap and slip off the lid suddenly when using it. However, once I got the method down, it has helped me to quickly open containers I used to have to spend several minutes on.
Not worth the extra damage if you have regular mobility issues, particularly related to pain. However, if your mobility concerns aren't pain related/you just want a faster time opening things, this may be helpful.