This  box spring gets a A on how well thought out the DIY assembly is. Easy to put together, SPARE screws and even a little ratchet allen wrench to make it even easier. 
Vey thoughtful. There is velcro on the rails and on the straps holding the boards together. 
The cover fits over everything and is held snug The bottom is open and exposed but that means air flows even easier.
My old box spring was starting to squeak so it was time for a new one . 
I used it under a very tall hybrid foam mattress and was the perfect height on my bed. Slept on it and so far it was quiet and supportive on my mattress.