This mattress was immediately more comfortable than my previous mattress.  We did allow it to “air out” for a couple of nights before we used it due to the smell as well as to let it warm up after delivery in winter cold.  I do not sink into the mattress or burn up on the mattress like I did our previous foam mattress.  It does not sag like our previous inner spring mattress.  My husband is much heavier than I a usually tosses, turns and bounces all night.  I have felt none of it if he is still doing any of it.  We have tried so many mattress and are so happy to have finally found one that works for us.