I bought this music sheet holder for my small room where there is no room for things on the floor. It is attached to my office table and it holds really well. I can now study music without having everything running on my floor, making it impossible to walk around.
I also really like the fact that it is stable and stays in plays without relaxing its grip. The only thing that is a bit unstable (though not a problem for me at least) is the holder itself, which, if turned slightly, will make the screw go loose. After that you have to tighten it a bit to make it stand its position again. But if not moved, it just stays perfectly in place.