We are agonizing over whether to install a Bruce floating hardware floor or a Kahrs floor in our kitchen / dining room / living room. We've heard that many installations of floating hardwood floors that involve glue down are problematic because areas of the floor become noisy when walked over (because the floor pulls up). The Kahrs 15nn Woodloc product is glueless and would seem to get around this problem. Others with opinions about installing floating hardwood floors on concrete slabs? Given that a moisutre barrier is installed under the floor, what disadvantages are there pertaining to glueless floating installations?