I ordered 3 each of the 518s and 524s.  They all fit a little different, some a little tighter and some a little longer but they all fit fine.  The 518s ride low on the hips and the 524s ride very low on the hips.  The only complaint I may have is the fact that they are kind of skinny right below the knee where the tops of my boots are but other than that I love them.