Love how they look on our wall.  Hubby and I bought a bunch in both the 24 inch and 36 inch and hung in a zig-zag pattern along the side of our stone fire place.  This added a lot of depth, charm, and functionality to our blank wall.  It looks way better than a standard bookcase would.  The shelves were easy to assemble and hang.  Yes, the pipes were greasy.  We used rags to assist with their assembly.   The wood used is sturdy; and though we did not put anything ridiculously heavy on top it does seem to hold a good amount of weight.  I would definitely order this product again.