Safer during one handed use
"This switching mechanism makes one-handed use of my duty pistol safer and more functional. The light can be activated in intermittent on or strobe modes simply by squeezing your middle finger a little tight, leaving your trigger finger indexed as it should be, safely along the frame or slide and free to engage the trigger if necessary. This simplifies one-handed operation. Although constant on cannot be activated using this switch, this is not a drawback and is actually preferred. The one slight drawback to this switch is that it enlarges the dimensions of the trigger guard, albeit very slightly, enough to make holster fit tight or, in some cases, unusable. There is no issue in my duty holster but I must change out my light for one without this switch when wearing my administrative paddle holster. A minor drawback and still a very worthwhile accessory for duty use."