I usually like my mattresses as hard as rocks, and this mattress is almost too firm for me. I tossed a 4" mattress pad on top and it is absolutely perfect! My chiropractor remarked on how much happier my back and neck were, not even knowing I'd been sleeping on a new mattress for less than two weeks. I ordered the split box springs for two reasons: 1) I have a narrow hallway with a weird double turn I wasn't sure normal box springs could get around and 2) I rent, and should I need to move, they'll be easier to handle. Very pleased with the split box springs. Great purchase - thanks to all the previous reviewers for the recommendation.