Generally, this holder has only one catch, but it is annoying. The screw connection between the upper mounting plate (table side) and the support arm is designed too low for the generally high weight of the holder in combination with the PC. Through the load and the gravity of the arm schwänkt back away, so that the PC is no longer just stands and slightly bends away to the side.
It should be clear only for the developer but probably not.
Otherwise, it is easy to assemble and is made of sturdy materials. Only in the construction was definitely not quite thought along.