Because this system is the only one currently approved by NATO, I would think it is more rugged, as well as practical. It becomes an integral part of the gun which protects it, and doesn't look "glued on". It also utilizes the slide release switch to turn it off and on, no "add on" switches are required. Bill T.
http://www.lasermax.com/products/glock.php
http://www.lasermax.com/products/glock.php