I ordered 2 of these for a second time in the past few weeks.  I was so happy with my first order, that I had decided to purchase again for our second set of twin xl matresses.  On my second purchase, I recieved different beds.  The second set did not have holes for a headboard, and the corners were not rounded.  My husband had an easy time putting them together.  We are using inexpensive off-brand memory foam mattresses.  I can’t tell a difference without a box spring, but my husband says he can.