This is a great piece of furniture--it's very durable, and after 2+ years of use doesn't show any wear or sagging. It's also very comfortable, and its great low profile works pretty much anywhere (it fits under two long windows without blocking the view.
The only complaints I have are that the levels are slightly different heights, making it somewhat awkward as a "queen" bed. And, while the top cushion is pretty firm, it's much softer than the bottom platform. Usually, we just use it as a platform for an aerobed. Also, the bolster is not very functional (as would be the arm of a couch) unless it's supported by something else; it tries to roll away and puts a lot of stress on the stitching that holds it in place. We've pushed ours against a wall to avoid this.