Instruct: Classify a given Amazon review as either positive or negative.
Query: Whitmor 4-Tier Shelving Unit

I bought this type because they are the ones used where I worked to hold suppplies and computer equipment.As advertised, this shelving unit assembled very easily and quickly. I thought I had a problem with one of the shelves, but then I noticed it was upside-down. After turning it right-side up, it slipped onto the holding brackets with ease. So far, it is holding up nicely in the garage.