My wife and I have often spent a night on the sofa sleeper without having any problems, we are average weight not overweight which could be the real problem. I found the sofas to be fine.
I don't think they have switched them over at BCV or BWV yet. At least, no one has mentioned it on these boards, and usually people shout that stuff from the rafters!!
As of June 22, no new sofa beds at BCV....just ask my poor dh. He slept on it for 4 nights and as soon as he got home, he went to his chiropractor!!! But he refuses to sleep in the bed if my dd is with us...he leaves that for me and dd. What a guy. Wish they would get to changing them all out.