I have two similar ones that are very useful and wanted a third. I like that this one does not come with the tray, because I don't use they tray. Mine came with one track piece that wasn't completely welded onto the side, but I'd planned to let one of my sections be double-height anyway, to fit a box I wanted to slip in there. If I needed that shelf, I'd have to do an exchange since the track piece is broken.I like that the top is flat. It keeps dust off of the books that I store on the shelves,See full review