I use this on my Varidesk standing desk and after two weeks I love these dual monitor stands. The action is smooth and stable and they stay in place once settled. Highly-adjustable. During setup it may seem like the sprockets that connect the monitors are not mobile but that's just because they were designed to be moved while supporting weight. My setup has two 23-inch Asus monitors - this is the third set of adjustable monitor arms that I've used and they are my favorite.