I bought a Ghostbed 2 years ago. It's awesome if you like a firmer mattress. I'd also recommend king size. Changed my life and I'm not even married.
100% agree, I had a GhostBed, but it was too firm for me. Their "return" process was really easy, you just donate it to any charity, get a receipt, and send it to them and they give you a full refund. If you like firm mattresses definitely consider GhostBed.