Purchased this product when it went on sale - it's the most I've ever spent for a flat-pack bookshelf, but it was absolutely worth every penny.  This shelf is sturdy beyond belief - I've basically loaded it with books, and it's still solid as a rock.  Assembly was time-consuming and required a lot of attention to detail, but I was able to put it together by myself with a screwdriver in about 3 hours.

Pros: Great value, Sturdy, Unique
Cons: Time-consuming assembly