The shelf quality is excellent.  The shelves are able to hold a lot of weight. 
The one improvement needed is the “picture only” direction sheet. I must admit I had to watch the “Honey-can-do” YouTube segment on putting the unit together.  Watching YouTube made assembling the shelf units much easier. I purchased 4 of these shelf units. I have assembled 3 of the 4. I need to find plastic pieces for the 4 pole tops,  as they were not included in the box.  Although they are not shown on the direction sheet for materials, they are shown on the YouTube demonstration assembly, and were included in the other 3 boxes. My “4” star rating is due to the “directions”, or lack there of, which were included in the box as well as the missing pole tops in box 4.