I looked at lasers on a pistol as a con and not a pro, due to failures with 3 out of 3 Lasermax models our folks had.
LAV turned me onto the CTC LG's in about 2006. I tried them for awhile, then dismissed them.
Later on, I gave them another go and found that, for me, there are situations in which they are useful.
IMO, yes. Esp in lowlight, or in unorthodox shooting positions. If a shield bearer, definitely.
Use the sighting system that you see first. Sometimes, it will be irons (bright sunlight, distance), sometimes, it will be the laser (indoors, lowlight, or when the irons cannot be in your eye-target line).
Switchology can be a deal breaker or maker. You have to figure that out. The rear activation lasers work pretty well.
Do you shoot with gloves? Depending on thickness, or hand size (sausage fingers), may block the beam.