It works. But not all the time and not from very far away. Works best from within one foot away from my camera. I used it to get into the picture, but my arm was extended, point at my camera. It would not work from inside my light weight windbreaker pocket. The pre-flash signal when the camera fires. Wished it worked at distances of 25' and from a pocket. But for the price, it will work most of the time for slow shutter speeds.
Pros: Small, easy to use. Fast service from Crutchfield.
Cons: Does not always work, must be close to camera, and can not be used if covered by a pocket for concealment.