I like this design. It attempts to do everything: the head unit comes with everything you need to hold a mobile phone, a 1/4" screw for old fashioned camera tripod mouts, and a gopro mount that screws into this mount. Pretty much all the mounts you'll need. This head unit is very well designed, pretty much everything in one flat unit that cleverly folds out when required.

The ball mount is very solid: the actual ball is the only metal part, and feels very solid. It seems to be well embedded into the magnetic clamp, not likely to escape with your camera.

There are 6 strong magnets in a circular base. If you attach the mount to a metal surface it feels very solid, not going anywhere. The bottom is rubberised so shouldn't scratch the surface it's stuck too, as long as that surface is clean. It really needs a flat surface tohold on to. The 3KG weight limit seems reasonable for general use, but I would use a tether for anything monuted to use on the outside of a vehicle where wind resitance could tug it loose (at least until it proved it's worth).

So overall, a very interesting device which could be yet another way for me to mount a camera on a motorcycle, or on any metal surface with minimal fuss. Once I've tested a little further I will update...