I'm thinking of installing laminate floors. Any advice or COMPLAINTS/issues?

I have them. I am on a slab meaning the floor base is concrete. As the floor get older it warps slightly so the seams show more. This happens in the kithchen by the sink more than dining room. But I have noticed the floors are not as solid at the seams as when I bought the house 4 years ago. The floors had just been put in at that time.