laminate over concrete

My husband and I are ready to purhase laminate for our living room /hall. We were ready to buy Kronotex Quick lock/quiet step pad from Lowe's. Yesterday, my husband was poking around at floors.com and spoke w/someone who said "you should put down a separate pad and not buy the padded planks if you are laying it over concrete." I've been reading this board and have not seen that mentioned. Is there something I'm missing?
Any insite appreciated..

 

ithink they were just trying to add insurance to the job.Generally if you purchase something that already has a needed ingredient that is usally sold seperate then you give something up, quality is what usually goes first.Did that make sense?Like those vinyl tile with the glue already on them,junk,get the padding separate from the flooring i think you will be happier

 

The guy at floors.com wasn't educated on the products he is talking about!!!

The attatch cushion makes the floor so much more quieter, if it has any hollow sound at all.
The separate 2-in-1 cushions(it has the poly plastic moisture barrier and cushion) are great and work well, but can't hold a candle to the attached cushion on any manufacturers product.

You still need a poly moisture barrier under the planks, covering a concrete subfloor or peer & beam with low crawl spaces, or humid basements.
It cost me $3 for 25'x10' 6-mil poly plastic moisture barrier. Compare that to the cost of the 2-in-1, and some of that cost is attached to the laminate too(cushion)