I have one of these on each of my 3 bikes which allows me to have one Varia light which I can quickly and easily attach to the one that I choose to ride. It makes for a compact arrangement for both light and computer and the light doesn't take up additional space on the handlebars. One drawback would be if there is no round place on the handlebars to attach the mount such as on some of the one-piece aero handlebarstem combinations.
use this mount for my garmin radar monitor on flat bar bike. Very secure providing excellent positioning for viewing while keeping your eyes on the road. Quick detach 1/4 turn works great to take monitor with you when leaving bike unattended or for charging. Took one star off because it is a little pricey in my opinion.
This is a good Garmin computer mount that allows quick & easy attachment of a Garmin Varia light underneath the computer. By having these mounts on several bicycles, it allows the use of one light to be available for all of the bikes. The only disadvantage is that lights other than Garmin may not be adaptable.