I gave them a 5 because the quality and workmanship exceeded my expectations. Everything lined up correct and they even provided extra bolts.  If I were to change anything I would prefer the back be taller.  As displayed in the picture, the back only clears the counter top by a few inches. 

They were simple to assemble as long as you didn't try to follow the enclosed directions.  I believe they were written by someone that English was not their primary language.  We ended up not using the directions and the process went quick and smooth, so maybe that's why we had 2 extra bolts.