These are boxes from most of my Crimson Trace lasers. I also have lasers from LaserMax and other.

I tell/show people that by activating the laser when the gun leaves the holster there is no wasted time in the extremely rare case of the laser not working. You just continue to elevate the gun to the normal position and use the "iron sights."

Pointing a laser is like pointing a flashlight. If you have to fire the gun it goes bang and the bad guy will see a flash and know where you are.
Both of my on the job discharge of firearms took place at night. I would have loved to have a laser available back in the day.