These box springs are exactly what I needed.  I had ordered assembly-required twin-sized metal box springs last year, but this was even better.  I needed a split box spring due to a narrow staircase with a corner.  I was a little hesitant about the folding part, as I was worried it would make things more complicated.  These couldn't have been easier.  Each one part light and small enough for me to carry upstairs by myself.  The "assembly" was to unfold, zip up the cover, and put in place.  I don't notice any difference between this box spring and my previous traditional box spring (that couldn't make it up the stairs).