If you have a house that seems to veer off in every direction or additions were added with no continuity you probably have a difficult time deciding how to layout the floor for your renovation. Do you like thresholds? Changing directions and surfaces? Narrow hallway opening into a large room? Probably not. That's where the diagonal comes into play. It's more money, (due to spoilage) and more labor (due to additional cuts) but it's well worth it in the end, in addition to the overall look. You eliminate awkwardly juxtaposed rooms where a narrow long hall goes into a room and the flooring seems to go in the wrong direction and another room goes off from there or it appears you only had scraps left over with all short pieces remaining. Be sure when you lay this out to always mix the lengths of the wood pieces for better flow and continuity.