It's designed to stop you shocking your PC components to death when working on them. So far so good. I've found it to be very useful and have not had any negative experiences when using this product.
Very pleased with this product, it works perfectly, arrived mint condition, arrived very quickly. I would recommend just for a cheap wrist-strap, nearly like a disposable one. Only bad thing is the colour was different but I really don't care as it's not going to affect performance.