I see no need for lasers on handguns. I see people try to use them as a training device and they end up relying on the dot and miss the point of training. I feel that one has to master the basics of gun manipulation. This starts with getting the grip right and then work through sight alignment and then trigger control. Too often, these basics are skipped in favor of this new rage, the laser. If you are working on the proper basics, then as you dry fire, you will be concentrating on your front sight and see what movement there is. Of course there are other parts to the story, but this is the start.
Second, in the gun industry, we need new "stuff" in order to sell product and this is one of them. Then people set up new classes for it and they sell.
Third, Having a bit of insight with some swat teams, I know of some who have tried the laser approach and have determined them to be unacceptable. Why, try to do an entry with numerous lasers and no one is sure of which one belongs to them. People begin to look for the laser dot and it takes away concentration on the tactics. Lastly, the bullet doesn't always go to where the laser is pointing. They need to be sighted in and they do change zero.
My advice is to get some training in the basic gun manipulation skills and then move on to drawing, shooting on the move, strong hand/weakhand, malfunction skills, reloading etc. Remember, many people have learned to shoot without the "aid" of a laser and will continue to do so. Just my 2cents. Take it for what it's worth.
Cheers, SSC