It's a personal preference thing. The only way to really find out if it's for you is to get one and do some training with it.
Personally, I'm in the no-laser camp. Like Rpg, I prefer plain black sights, even in low light situations. Unlike him, however, I don't believe that front-sight-focus is necessary. I use a target-focused approach, but I still bring my gun up into my line of sight so I can get a rough visual index or see "through" the sights (target's in focus, sights are blurry). I can still get good hits with that method, even at longer distances. For defensive shooting, I want the chain from "this person is an immediately lethal threat to me" to firing to be as short and as simple as possible.
While there will certainly be some exceptions, I believe that if there is enough light for you to clearly identify a threat, there is enough light to get at least a rough visual alignment on target. If it's too dark to identify the threat, then you either need to illuminate the possible target to confirm it's a threat or you shouldn't be shooting.
At extremely close quarters, when one is most likely to use "true" point shooting (i.e., the gun is not in your field of vision), one can still get good hits on target without a laser, presuming you've got a decent level of "muscle memory" ingrained through training.
Having said all that, I will add that there are two areas where I think laser sights are useful. One, is dry fire training. Seeing the dot bob and weave as you pull the trigger can help with improving trigger control. Two, shooting at odd angles. There may be some situations where you need to fire, but, for whatever reason, getting some kind of visual or physical index on target isn't possible. A laser can be handy in situations like that.
Just my opinion.