Assembly was fairly simple, plus keeping the bolts at each corner somewhat loose until the end helped me position all of the cross bars into their slots.  (Of course, I made sure all of the bolts were tightened up, when finished.).  The other metal bed frames I’ve had have all sat just a few inches above the floor.  But this bed frame sits up much higher and automatically places the mattress (without box springs) at the perfect height for an adult to sit on.  So it looks like we won’t need to buy a box spring.  We also like that so much storage space is underneath this taller frame.  Cross bars at both ends (yellow stripe shown in photo) have an adhesive strip, to help keep the mattress in place.  It's a great solution for our needs.