Bought the full bed for our 5yr old and honestly, I was surprised at the quality of the bed. For starters, the box arrived on time via FedEx. It was heavy and had to request the FedEx driver to assist me get it inside the house. Assembly takes about 2hrs and its not complicated, just pay attention to detail. The bed frames are sturdy, and the mattress slats are made of soft wood. No need for a box plot since we had a 9” mattress. The bed has a center mattress support made of some kind of metal, looks flimsy. I weigh around 210 lbs and I lay on the bed comfortably without any creeks or squeaks. I think it’ll be a good big boy bed for our 45 lbs son.