Replaced the traditional, basic metal 9 leg bed frame with this platform bed.  Tremendous improvement in the support, no more sagging mattress.  We were considering pitching the mattress thinking it was worn out, not any more.  We were also able to get rid of the box springs -- they would have made the height too tall and they are simply not needed with this type of frame.  This frame gives full support to the mattress with 13 rows of slats.  I can recommend this to anyone.