Overall the quality is good. However... to many pieces are to similarly shaped...and the pieces fit loosely, so that means it is very easy to place the wrong pieces together... this is especially true in the top section. Where a lot of pieces are Blue with grid lines. Sure, you can try to line up the grid lines... but there are so many possible combinations... I just got to the point I said good enough. Glued it. Even now I see pieces that are obviously in the wrong spot, and I can't unsee them :(.