We bought our Queen size SC in 2001 and have loved every minute of it. We bought just the mattress, and got rid of the old mattress in our fiver. We are full-timers, and the SC weighs about a quarter of what the old mattress did. It fit right on the pedestal without any mods needed. What I like about it, as someone already mentioned, is it is adjustable. You are not locked into one setting. With my back, that is a blessing. Sometimes I have it pumped up so hard I almost roll off it because it puffs up a little in the middle. After a night or two of that, when my back gets better, just let air out and get comfortable again. We don't know what our numbers are, because we got the less expensive version. We just go by what feels right. If you buy it and decide you don't like it, you still have the 30 day guarantee, or I doubt you would have any trouble selling it to someone else.
Steve