I purchased this shelf based on previous positive reviews and was not disappointed. The quality of the unit far exceeds my expectations and what was going to be a quick buy before I could build my own shelves has now become what I'm going to purchase instead of building shelves. Extremely happy. This unit does not sag or sway like many other so called "Heavy Duty" units I've bought in the past. Not to mention that it took me less than 20 minutes to build the entire thing. I expect the next one to take even less time.