First of all, it is not just a bike holder, it is a multi-holder since it can be attached anywhere, which makes it particularly useful. Unfortunately, however, there is a serious manufacturing flaw; while the plastics look sturdy and well-made, the way the top part connects to the jaws is laughable. The entire tower is supported by the clamp with a small sheet metal screw, which actually stops before tightening, and a small spring takes over the rigidity of the system (they did it this way so it can rotate). As a result, the entire top part wobbles significantly. I fixed it by putting glue at the joint and I only use it with a cheap action cam. I am not going to put anything expensive or heavier on it.
Here is a related video:
https://youtu.be/oAI8VXTleaY