I don't have laminate flooring, but I do have a steam mop. I have used it on my sealed real hardwood floors, and it seems to be just fine. I agree with the previous poster that I think the steam mop probably leaves less moisture than a real mop. It leaves the surface damp but it dries pretty quickly.
Depending on what model you get, just watch out that you don't leave it in the same place for too long. Once you plug mine in, it starts producing steam right away. So if you left it upright in one place while plugged in, it would steam the crap out of the floor underneath.
I have been a little disappointed in the performance of my steam mop though. I see that the pad gets dirty, but it doesn't clean textured surfaces as well as I would like. When I really want to clean the floor, I used a Swiffer with the wet pads first and then the steam mop to clean up the residue.
