I believe all the negative reviews pertain to engineered wood floors. I've used this on my non-engineered true hard wood floors and the product seems to be superb. Even my flooring installers recommend this. That said, they suggest to only polish twice a year, anything more than that is too much polish. Also note, engineered wood floors are NOT the same as true real hardwood floors. Engineered wood floors by definition don't need to be polished because of how they are made where as true hardwood floors need the extra care to make them shine since they are installed, stained, and sealed on site at the place of install.