My wife and I have a Queen 5000 for the past 3 years. Like many reviews, it has started to sink in the middle but only on my air mattress. I have been waking up with a sore back, but my wife has no problems. As far as the weight goes, I don't think that is the problem, I am 160 lbs and my wife is 125 lbs. I would like to think that a new air mattress for my side is all that is needed to solve the problem... The other thought I have on this is the number setting... we both sleep at 35 and I am wondering if the lower numbers cause the problem.