My DH says (and I agree) that our Sleep Number mattress (you sleep on air!!) is the best investment we've ever made... Several friends bought one too, after we went on so about ours!! 3 out of 4 couples just love theirs, too... but 1 did not... gave it to her DD and DSIL and they love it? DH had backaches... gone!!
I won't ever sleep on anything else!!