Are there betters out there? I am sure there are but for this price it would be very hard to find a better one. It's pretty solid and the clamps are real heavy duty stuff. The entire construct is solid. The tray did initially experience some resistance sliding back in but that is gone and it operates very smoothly now.
My mouse is very sensitive to any unevenness of surface. So far no problems which indicates that the tray once clamped securely onto the desk does not move or get loose. I have not tightened the clamps since I installed the tray. It has given my wrists and shoulders a new lease of life. A very valuable budget option. Recommended.