For the price I paid, I was really disappointed at how cheaply it was made. The entire back of the bookcase is, not one, but TWO pieces of thin cardboard that's folded in three. Even after lining both pieces of cardboard up with the edges and nailing them in (there are 46 nails holding together the thin cardboard back), it doesn't stay flat. The back warps in towards the books. There is also a designed overlap of the two cardboard pieces, which means a tiny gap, which I can see from the side.
If it weren't for the back, I would've had no complaints with this bookcase other than the state it arrived after shipping