Quite difficult to assemble as step 2 literally included like 5 different steps and I ended up putting on the two side slabs upside down AND on the wrong sides, which frustrated me A LOT although it may have also been my lack of comprehension because I had just come home from a 10 hour shift and I set it up as soon as I got home. Regardless, steps were a little confusing and I wished things were more clearly labeled but I figured it out. Im not a small person and neither is my older sister whos staying with me but the box spring seems to hold up quite well even with me unintentionally plopping on it at times lol.