Solid !!! Swimming, biking, running, and also installed on the back of a dog (medium and large). Also ideal for shooting discreetly without having to hold the GoPro in hand (visiting Paris).
Negative: the screw to secure the GoPro system. The nut is not included in the plastic and suddenly turns along the screw is tightened. But for the price nothing serious. I use the one received with the GoPro.
I Board occurs for those who do not wish to ruin.