We believe that our range of height adjustable desks are the most stable option on the market.  The nature of any object of the dimensions of a height adjustable desk will be prone to some movement when at height, but this is minimal, and the desks are precision engineered to ensure you have the best, most stable user experience.  We would recommend ensuring all fixings are tightened correctly, and the use of a quality monitor arm to ensure that your monitor/equipment on your height adjustable desk is secure.