It does depend on why it is being used. It is designed to prevent male performance not necessarily ejaculation. I tried one on a dare. (Long story) It can be cut off. It is power exchange. NOW! I am not as sure I'd try a metal one. My key holder was three states away. Hell. Send me one!
I had a CB-6000 and could the same. It is not designed to prevent that. Fact is just walking in it turned me on. It does limit a males performance. I'd go metal next time. The plastic ones break.