Very good product. Works as advertised. Documentation is short and very informative. One place for improvement would be on rotation for my monitor. My Samsung (28inch) monitors have the mounts at the top of the monitor. This make it impossible to rotate my monitors. I wish I could increase the tension to allow me to rotate my monitors. If the mount was on monitor was centered rotation would be no problem.
It is very helpful to clear up desk space. My only small gripe would be the up and down motion of the outer arms does not lock into place as easily as one would think so the weight of the monitors wants to drag them down if you bump them accidentally.