I may be the lone man out here, but i bought the best tempur-pedic you can buy and it made my back problems worse than they were before. My wife who never had back problems, started having them after purchasing the bed. After 4 weeks, ended up returning it to raymour and flanagan and went with the firmest stearns and foster you can buy, no back problems since. general rule of thumb is, you need back support, and while the tempur pedic are firm at first touch, the end result is u end up sinking and your back is in a sag position the whole night vs being nice and straight.
In addition the foam mattresses make you sweat more than usual.