We bought these to replace wood bookcases we lost in a sewer back up in our area. One million home affected- we had 3.5 feet of sewage in our basement and took a substantial loss. These are great and hold what is left of our massive book collection. A lot of pieces to assemble but I put three of them together in under 2 hours. 

Pros: ample storage
Cons: a bit wobbly on uneven basement floors- we used black zip ties to hold three of them together