I like the laser because I find it faster when I am without my glasses. It also allows me to watch the threat, which is important and more natural than trying to see the thirteen striations on my front sight.
90% of my training is without the laser. I don't go looking for the dot. If I see it great, if not I'm using my sights, which I would be planning to do anyways. This is one of those, if it's there use it, if it's not then don't waste time looking for it.
I've found that to be a very natural and quick approach for me. YMMV. BTW: I favore both Night Sights and CT Laser grips, but if I could only have one it would be the laser.