This is an awesome frame for a great price.  Because the headboard is adjustable height-wise, It does work as a platform bed without a boxspring IF you use extra slats, as it doesn’t come with enough, only 4.  I made an extra 8 slats with feet with cheap (around $30 CAD) 2X2 wood pieces from the hardware store and it supports my 10” queen-size memory foam mattress perfectly.  I am very happy with how this frame turned out.