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What makes this neck mount effective is the construction of the straps that hold the mount in place. K&F says its made of "silica gel", but what this means in practice is that the straps can be formed into whatever shape is needed to hold the camera securely in place and they will retain that shape. The straps don't allow the camera to flop around loosely like a fabric or rope strap would. The neck mount is nicely weighted which further serves to keep the camera steady while filming.
There are two mounting options for action cameras: either straight to the neck mount or using the included J-Hook (see photos). The J-Hook has a ball-mount which allows the camera to be mounted at a wide variety of angles. As well, it moves the camera further away from your body which makes it easier to see the screen. The downside to using the J-Hook is it makes the camera more noticeable and the camera tends to move around considerably more as you walk, run or engage in any other activity, since its weight is further away from your body.
That said, I have attached a video to this review with me walking at a brisk pace and the camera mounted with and without the J-Hook, and it seems the stabilization on my Osmo Action 4 camera largely made up for any extra movement in the camera as I walked.
In the end, I really like this neck mount and think it's a fantastic, secure and relatively subtle way to film hands-free.
