depending which sales person you talk to, the outcome varies. as a disclaimer, i'm a novice when it comes to furnishing matters and my experience is based on my gatherings over the past 3 days at the furniture expo fair. company A, selling high density foam sofas, claimed that pocketed springs are not good, since springs will lose their shape after a long period of use. company B, selling pocketed spring sofas, claimed that high density foam will lose their shape after a long period of use. In the end, my wife and I bought a goose feathered sofa