Just put this together (queen size) and put down the brand new mattress too. Not too happy with the quality of this frame as it has already bent when I sat on the edge of the bed to test the mattress. I’m 135lbs and I was sitting for maybe 5 minutes at most. I just reordered the H bar cross piece that bent but I’m afraid it will happen again. Clearly this bed doesn’t have enough supports if it can bend that easily.