I enjoyed putting this item together. It has been cleverly designed compared to the many plasticdisplay boxes I have put together in the last year. I used the instructionI notes on the site. I found them to be clear. The only exception is they left out what to do with the small black circular knobs.This storage unit is made of plastic but the parts are thick and sturdy. Each storage box once placed on the others reinforces the stability and strength of the entire unit.Most of the parts are already attached to each other. So you don’t have to use too much of your brain figuring out where to position them. That is a big plus.The tabs that lock the pieces together are accurately placed. There is some difficulty “clicking” them together. You have to try different ways to do this by putting finger pressure at the correct point where the tabs should lock. This took up a part of the installation time. But in all, I had the item finished in about fifteen minutes.The wheels spin easily. Two of the them have wheel locks to prevent movement. II would recommend putting the heavier articles in the lower draws on the unit. I am very happy with this item. Oh yes, I almost forgot - It is a very nice looking piece of furniture.