Went together as advertised with a rubber mallet (except for decorative tops that I chose not to install).  The box is assembled using roughly cut mortise-and-tenon joints with some pieces that you may have to use a little force to fit - hence the mallet.  The only issue I had was one of the legs split partway down one side of the mortise as I pushed the side piece into place.  I was able to use wood glue and a clamp to fix it after I finished putting it together.  It nicely serves its purpose as a small raised planter on my deck.