I have a new home with over 1200 sq ft of Robins 3/4 nail down hardware. The but joints are so high you can catch your sock on it. The factory rep has checked twice and claims they are some problems but most are in factory tolerance. I have had two other flooring companies look at the floor and call it junk. I'm waiting for my builer to replace the floor at his cost whitch he has agreed to do.