There is only one gripe that kept the add-on unit from getting 5-stars. The S-hooks used to attach the add-on unit to the standard unit made the add-on shelves sit 1/8" higher than the standard shelves they were hooked to. This is really only a noticeable problem in tandem with wood inserts for the shelves. Now, when looking at the complete unit's continuous shelving (even when stocked with groc