I bought the 18" option to go in my powder room.  First off, being able to select a size is fantastic; I was having issues identifying something that would fit in my small space.  The impressive bits about this shelf are the thickness and weight; it is very sturdy and beautiful to look at.  The brackets are easy to install and use, but I would recommend investing in some good dry wall screws; those provided broke half way into my pre-drilled holes.