As boring as it sounds, purchasing a good mattress versus a cheap, flimsy one is a choice between one that lasts up to ten years and one that lasts less than two years. Not to mention, the comfort level between the two options should make the choice for you. Would you rather spend your nights sleeping on an uneven, droopy surface that triggers your lower back problem and makes you miserable and less productive at work (for lack of real rest) or one that is firm, stable and offers comfortable support for your aging body?