Was heavy and sturdy.  Easy to put together and just what we needed for a narrow hallway.  We were a bit confused at first and had the wider part at the bottom, thinking that was the base but then the bolts were showing.  Then we realized the entire shelf was upside down and the wider part goes at that top.    

Pros: Sturdy! We really like the label areas because this was for a veterinary hospital and were are always missing books.  This way we can put them in categories and everyone will be able to fine just what they are looking for. 
Cons: Just a bit confusing on which end was the top.