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I prefer a laser on many of my carry guns, but for a number of different reasons. The primary reasons are:

1. Training aid during dry-fire practice. ensure the weapon is unloaded and perform dry-fire practice with the laser on. If the dot moves then your trigger discipline needs work.
2. Backup to the sights. I had a friend break the front sight on his Glock once (Not sure how, but he was excited about it), and I managed to damage the front sight on one of my 1911s while in a class once. On top of that who's not to say you won't bump your sights out of alignment while carrying, I know for a fact that it's happened.
3. The capability to aim the weapon from a more exposed position while keeping your head in a less exposed position might come in handy, I doubt I will use it but it would be nice to have if I needed it. On the same line of thought, I doubt I will need a handgun for self defense but I carry one because it would be nice to have if I needed it.
4. If the threat is standing with a light source directly behind them you get a great silhouette but depending on lighting conditions your sights may not be visible, however a laser will be.

Now with that said I do have a few rules for my lasers:
1. Batteries get changed yearly, or sooner if the laser acts odd.
2. I practice with and without the laser.
3. I use the laser a lot when I perform dry-fire practice.
4. I never place myself in a mindset where I will depend on it, or expect it to be there.
5. I suspect the laser is damaged of has any problems it gets repaired/replaced.