The magnets work quite well but the glue or whatever is used to hold the magnets on the two ends of the camera came off almost immediately which resulted in me fell off and temporarily lost my keys while walking or going up and down stairs. They held up when the load and my walking pace were light, but not great when I needed to walk quickly or climb stairs, which rather defeats the purpose of using magnets for that purpose when I'm not sure what's attached to them , stay connected to me. A slight twist of the magnet or a quick release button would be a nice feature to improve on this idea or just find a better way to attach the magnets to the cameras or make them one piece. The magnets themselves seemed strong enough, but stronger wouldn't hurt. It's hard to say given that the magnets fell out of the chambers so quickly with every movement, more than a slow, steady pace.
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