First off, never rely on a laser to deter someone from doing you harm. A laser on a BG is not guaranteed to make him surrender like in the movies.
That being said, if you needed to draw your firearm and it's equipped with a laser and the BG looks like he may be thinking about taking a chance to do you harm anyway, you could always turn it on with your support hand to give him a clue. This is just a scenario that could happen, probably won't,percentage is super low that it would happen, but enough of a chance that it's nice to know you have something attached to the gun to allow you to say "hint hint".
I shot my BG380 with the laser and it did extremely well and the laser is still in it's original configuration/orientation from the factory.
I remember seeing an ad for Crimson Trace where an officer was on the ground after pulling his BUG from his ankle holster with the laser pointed at the BG about to swing down with a crowbar or some other weapon. The officer did not have the time nor was he in a position to get a sight picture. The laser would be a plus in this scenario and that's where the laser excells. It's not about being "laser accurate" but being an aid ONLY when you can't use your sights or get the gun up to eye level.
One must train with the laser though so it's as second nature as the rest of your gun. It's also important to make sure it's still on target after a range session. Although most laser stay put to point of aim, if it can stay in orientation enough to get through an entire mag, it did it's job.