Unit is easy to assemble. Takes about 15 minutes to assemble. I built it on the wall and not on the floor. Hung each side on the wall bracket and then loosely screwed the lower shelf and the top shelf on to the side panels. Tighten the 8 screws and then installed to pins for the remaining shelves. The unit can be assembled alone with ease. The shelves and side panels are sturdy and should last a lifetime. I like the quality. All the holes line up. Zero issues.