I bought two of these in twin size to replace a metal twin/trundle set which was just too rickety.  I have one bed out and one frame folded and stored in the closet where it doubles as an art print rack.  Assembly went like a charm.  It took two people an hour to put the first bed together (we were being super careful and did not use an electric screwdriver).  The second bed took only a half hour.  All pieces fit together (we did use a rubber mallet), all hardware and parts were included and we even got some extra dowels in the package.  As everyone else has reviewed, these beds are rock solid and are the perfect studio bed height if you are setting up a room as a studio.  Weight limit on the twin is 500 lbs.  We have two twin mattresses on one frame.  Extremely pleased with this product, construction and value!!