Helps prevent accidental dropping of your camera.
This wrist strap is almost perfect. It velcros securely and attaches to the camera with easy to use, yet strong, "plug in snap" (not sure how to describe it). I can snap it in easily and trust that if the body slips out of my hand, it will catch and not fall to the ground. Once in a great while, if I absolutely have to, I can let my body and heavy lens dangle from my wrist if I need to use both of my hands for something, and the wrist strap holds on well.
My only complaint is that my wrist sweats pretty bad with the wrist strap on, but it dries out quickly when off. It is also stretched out just a tad bit where the velcro catches, but it is still going strong after about 2 months of use. For the price, I could see replacing it a couple times a year.