I am using my Temperpedic mattress and it's low profile boxspring and it was still too short that it created about 4" gap between the top of mattress to bottom of headboard piece.  There is an illussion that the entire headboard sits from floor to top but that's only the 2 sides pieces.  The middle piece is separate and is shorter.  I had to buy another boxspring to give more height to the mattress and it helped covered the gap.  I still like it because the headboard is very nicely made and I like the added height of my bed.  It's been a year since I bought it and I've had to vacuum once as dust collects on top.  

Pros: The tufting looks like good quality
Cons: The actual tufted part of the headboard is too short and is NOT full height.  The rails don't align too well.