Originally posted by joodiespost that looks like it can still easily slip out of your hands
The point of that device is not to weld the camera to your hand. As you correctly guess, it does nothing whatsoever to enhance your grip on the camera. There are other products for that purpose.
What this simple wrist loop does is to provide protection against a dropped camera smashing to the ground. It does it in an unobtrusive manner. It is simple to attach. It has an almost universal mount. It is lightweight. It takes up almost no space. It is flexible. It is less prone to snagging on things. It is neither comfortable nor uncomfortable; you hardly notice it is there at all. It is almost totally idiot-proof.
I will point out that this device is NOT intended to be used as a wrist strap to dangle your camera from as you walk along. Under such use the tripod mount screw WILL work itself loose. This is the strap for people who don't like straps of any kind, preferring to always have their camera directly in hand, yet who would like some protection against an accidental drop. I repeat: It is an anti-drop strap; not a carry strap.