Bought this for a Gel Memory foam mattress through Wayfair, which is fabulous.  The frame is pretty flimsy.  Not 100% confident it won't collapse in the middle of the night.  Main screws which hold the legs and sides in place don't thread evenly.  The slats are sufficient, and those are not the problem.  Overall platform surface is longer than a standard king-sized bed, so there is either a 4" gap at the head or the foot, your choice.