There's a lot of "gimmick" in laser sighting systems. One common oversight is that the laser beam itself provides insufficient light to identify a target in no-light conditions. Unless you have a flashlight or NVG, it's nearly useless.

A laser is far more useful in low-light conditions where your unaided eye can still gather enough light to identify the target.

However, you must be prepared for the worst of conditions - and you're likely going to need an artificial light of some sort in addition to the aiming aid that a laser would provide. Practicing with a handgun w/laser and a light adds a new level of complexity to shooting.