I am a writer with a big project due. I have had a terrible case of tennis elbow/mouse elbow. This device relieved it almost immediately. The device remains where you leave it and only moves when you move it. It is not difficult to assemble although it does look a little odd on the table. It has made my pain nearly disappear. Well worth the investment; good materials and good construction of the adjustors. Mouse pad is very good also. Highly recommended - without this, I could not make it.