we purchased our mattress at Sears. This bed is very firm. We purchased it because my girlfriend likes a firm bed. She complaint that soft bed causes pain in her lower back. i also have pain in the lower back during the night and after gettting out of bed. a hot shower usually helped.
After the very first night, we noticed an indentation where our butts pressed down. we are not heavy people (me-155 she-110). now after two weeks, the indentation is getting bigger. we can only feel it but not yet see it. The bed did solved our back pain problems. however, now my girlfriend is having shoulder problem. we are back/side sleepers. She tried feather bed as a topper. this helped her shoulder some, but her back pain come back. We tried different pillows like down, memory foam. but so far we can not solve the sholder problem. We are going to exchange this bed for something softer soon.