The thing is too big by about a quarter inch. So it didn't fit into our bed, even though our old Sealy box spring went in perfectly.  I had to plane down the wood and then pound it in with a mallet.  (It's basically just a pallet covered with padded cloth, btw, although it would have worked if it had been manufactured properly).   Tip: use wood screws to fasten the slats down otherwise they'll flop around as you maneuver it, even if the little piece of velcro (yes, velcro) holding the slats in place don't give way.     Do yourself a favor: keep looking.