A good box spring and not too difficult to put together. I believe there was an error in the assembly instructions. The "Top" part of mine needed to go to the bottom for it to work. 
It was surprisingly easy to put together. Even with the instructions being a little off. I just followed my instincts. 
It is very sturdy. It took me about 45 mins to an hours to complete it but I was not working on it steadily.
The bad: why oh why couldn't they place the screws in a bag and tape them up? So if you hear rattling in your box, nothing is broken there are just loose screws in the he box. Open it in a uncluttered location so you an find all of them. All of mine were there.