I am so so happy with bed. My free standing electric bed fits in it perfectly and was high enough that I could use all 3 slats to secure it. It also doesn't have that 6 inches of open space on the sides, but about 3inches. Just enough space to tuck in you duvet. 
This bed also puts together in 30 minutes. 
It is a beautiful foot and headboard and I can really recommend it to everybody. It was delivered by fedex one day earlier and came in 3 really well packed boxes. I was updated via email and text with the statis of my delivery.