I only have two lasers, both of which came with the two pistols as "part of the deal". Although I carry neither of these guns, the lasers on them have convinced me they are a great accessory to any CCW. They allow you to shoot accurately in ways simply not possible without a laser.
IMHO, laser use has nothing to do with light, low light, bright or dark, but rather it has to do with acquiring a target quickly without using the sights. Holding a pistol below the usual sightline, lased on target, gives the shooter a much better field of vision.
A laser can be a game changer all by itself as they may have a impact on the target's will to continue.
A laser is just another arrow in the quiver.