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very valid concerns...I think there is also some difference between manufacturers and also the thickness of the top layer of "engineered" wood...

You will also find varying opinions on whether engineered floors are viable for kitchens or under washer/dryer machines. I'd lean toward keeping engineered wood out of a kitchen altogether but with the new trend of opening one's kitchen onto the den or living room, many people want that all-one-floor look and don't want to break it up with tile.