I haven't used this on my Xdm 45. I generally don't want a laser on my pistol. I don't want to become dependent on it for aim. What if the batteries go out at the wrong moment? I do have Tritium sights on the gun so I can aim in the dark if needed. But if it's that dark I won't be able to see what I'm aiming at. The laser also gives away your position too.
That said I do have a laser mounted on my shotgun, along with a light with a momentary contact switch. The light is very bright and will blind the perp for a few seconds and at least leave spots in his eyes. But again, both the laser and light give away my position.