Haven't used them (yet!) but am very impressed with their design and quality. These devices are very heavy (and durable) and I have no doubt judging from the videos I've watched that they won't do the job. From gloves to an outstretched arm, this company seems to have thought of just about everything to get me (or anyone else) out at the right time. Good product, take it. There's not always a tree or rock to hold on to.