I'm just smiling all the way thru reading these replies. My hubby is a Pergo "Endorsed" Master Installer. Need I say every floor in my home is Pergo? The 'hollow' sound some people have is because they did not install 'Whisper Weft' or 'Silent Step' beneath their floors. One was a thick felt-like material in sheet form and the other a 'rubbery' cushioning on a roll. Laminate that isn't installed with adhesive also sometimes has that echo. Again, products and installing techniques are not the same when described by a 'salesman'. Brad spent 2 weeks in NC learning about the system and being endorsed. A year later they invited him back to participate in the master program which means he can do special applications such as inlay designs. If you plan to install yourself, ask questions about soundproofing, gluing and underflooring. If you aren't satisfied, go elsewhere. He will not install any floor without adhesive. You're going to love your new floor!