I haven't use the Laserlyte but I do use the CT.
Yes its a great training tool. Pick a spot on the wall and dry fire. When you first start you'll see the dot jump all over the place. Pretty soon you'll get your trigger control down where it doesn't jump.
Now hear is a little experiment. Before you use the Laser, go out and fire a couple clips/cylinders full of ammo. Save the target. Now go into the house, or somewhere else, dry fire for a while using the laser. Then go back out side and shoot again. Compare the targets. That will tell you the laser is worth its weight in gold as a training tool.
My back yard range is pretty bright (lots of sun in Wyoming) Can't see the laser for most of my shooting. But I do dry fire a lot with my 642. I can really tell the difference if I slack off on my dry firing.