Very heavy duty and sturdy bed frame! It was fairly easy to put together, although the instructions are not the best and goes by pictures but some of the pictures are inaccurate, but it’s pretty much common sense on how the parts are supposed to be facing to figure it out. I got the king size and have a 7 inch mattress on top. It sits off the ground pretty high being 18 inches, I wouldn’t want a much larger mattress on it! But it is perfect for storage underneath, my child can crawl around underneath of it easily because of how wide open it is. And it doesn’t budge or move around one bit, feels very secure.