Oh, my gosh.  This mattress is, to use a phrase by so many others on this site, AMAZING!  We finally discarded a very old mattress, box springs, and box spring frame (left them for recycle pickup) and replaced them with this Zinus mattress and Zinus metal frame and we are so pleased.  New materials, modern design, great frame - it's wonderful!  Supportive, noiseless, no jarring from partner movement, love it.