I run home a dual monitor system to which a PC, a Macbook, a Telekom Entertain receiver and temporarily connected an Xbox 360. After the desktop space always a Bissel is limited, I have resorted to a third monitor arm (also from Ergotron) plus bought this notebook tray. I can now post the Macbook much better and slide easily aside.
In addition, you can sometimes get up easily, rotate the arm on the back of the desk and work from there standing on the arm / tray.
Class processing - along with the matching arm Ergotron no really effective enjoyment - but certainly useful and definitely durable.
Strong buy recommendation for all who love the comfort.