My husband, the engineer, was very impressed with the closet by Rubbermaid.  The shelves have a simple locking mechanism that not only keeps them in place but enables you to overlap two shelves to get the correct width for you space.    We later needed unit for a second closet.  I purchase the "other brand". At local store and was really disappointed in it after using the Rubbermaid set.  Prices were competitive so why mess with the other.