I have long hesitated but decided to use the Walimex. I absolutely do not regret it. The adapter is made of metal and very stable. Although the set screw has a plastic head, makes this a quality impression. For me, the adapter maintains a video light and in a very firm grip. Small gimmick which I did not expect two small springs between the movable and the fixed part. These are also to be removed if not required.
Conclusion: A clear recommendation! - Very valuable - Solid - Well locked - Keeps accessories safely under control