I purchased four of these bookcases for my home office.  Upon opening the first box, I was taken aback by the bag of parts.  There were a lot of screws, nails, wood dowels and glue.  I thought "This is going to be so hard to put together."  My husband was game and we got started.  The first bookcase took about 30 minutes to put together and the remaining three were much quicker since we then knew how they went together. I gave it four stars instead of five because the back of the bookcase was not wood but heavy cardboard made to look like wood.  When books and collectibles are in the case, you can't see the back, so it was fine.  

Pros: Looks professional, all shelves except the middle one, are adjustable.
Cons: The back is not made of wood