And the salesman let me hammer on the sample and try to scratch it with a quarter.
We took a spare piece of ours and put it in a bucket of water to see how it held up. The Columbia clic barely expanded even after days of being in the bucket. But the bargain basement stuff expanded within 20 minutes.

Also some of the problem with water damage can be from a particle board underlayment. That stuff swells fast and then causes the laminate or whatever flooring you have to get messed up from the warping and bumps under it.

We live in the country and have gravel and grit from the driveway.
So that seems to slowly affect the floor surface by the back door with tiny tiny scratches but you have to be down on the floor looking across it to see those.
And our floors are 13 yrs old & kitchen we did in 05.

Oh I just got an email from the place we bought our flooring from - wanted to post it for you- it has a lot of good info on it for all kinds of flooring choices.
http://www.ifloor.com/
&
http://www.ifloor.com/about-flooring/