Very solid bookcase.  It was delivered in two large pieces (top and bottom) that screw together with provided metal plates and screws. The shelves seem solid and sturdy.  I'm happy with the overall craftsmanship.

None of the pictures here or elsewhere showed what was behind the lower unit doors.  Surprise, it's another shelf!  Unfortunately this shelf is not removable, which is unfortunate because it means you can't store large objects behind the door.