Even though I read other reviews praising its qualities, I was still surprised to see how sturdy and well-made it was. All solid steel throughout the entire construction.
I'm using 19" and 21.5" monitors, and they haven't moved a millimeter since I set them up a few weeks ago. There's a large range of movement allowing you to tilt, swivel, pan, whatever. I managed to the monitors right where I needed them, with a bit of muscle (especially for tilting, which is somewhat expected for sturdiness sakes).
Overall, one of, if not THE, best option for people wishing to save desk space. Especially for people who don't have the edge of the desk to use the clamp-style stands (like me).