I had bought the Standard Ergotron arm system and then remarked afterwards that I as planned could not align the system. After a course change, my monitor was too far away, so I resorted to the extension sold here. The extension is massive, like the rest of the system. They can be integrated seamlessly and holds bombproof. They did not feel that the system is now unstable, on the contrary, I suspect that you could add another extension easily.
