Years ago I read an article where Jeff Cooper mentioned that lasers were noticably slower than regular sights. Seems you spend a certain amount of time trying to see where the heck the dot is when you bring the gun up.
Had never tried shooting a laser-equipped pistol until last Xmas, when I found the above to be true. Kept looking for the dot, especially if the gun was not up in front of my face. Finally I thought, "Gee if I just present the gun as though I were using the sights, the dot ought to appear on the target since my presentation will be lined up". Did that, saw the correct sight picture instantly, reflexively fired off a hit in a fraction of the time it had been taking me to hunt for the dot, all without ever looking for the red dot.
At that point I realized that I had no real use for a laser. In the dark, maybe, but then you need a flashlight to identify your target anyway, in which case your sights will be silhouetted against lit target.
Forget lasers, practice focusing on your front sight, getting good sight alignment, and a surprise break on the trigger, learn the gun/flashlight technique, and you'll leave laser users in the dust.
My $.02.